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669900 = 2235271129
BaseRepresentation
bin10100011100011001100
31021000221010
42203203030
5132414100
622205220
75460030
oct2434314
91230833
10669900
11418340
12283810
131a5bba
141361c0
15d3750
hexa38cc

669900 has 144 divisors (see below), whose sum is σ = 2499840. Its totient is φ = 134400.

The previous prime is 669887. The next prime is 669901. The reversal of 669900 is 9966.

669900 = T5 + T6 + ... + T158.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (669901) by changing a digit.

669900 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23086 + ... + 23114.

It is an arithmetic number, because the mean of its divisors is an integer number (17360).

2669900 is an apocalyptic number.

669900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249920).

669900 is an abundant number, since it is smaller than the sum of its proper divisors (1829940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669900 is a wasteful number, since it uses less digits than its factorization.

669900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 669900 is about 818.4741901856. The cubic root of 669900 is about 87.4990476087.

The spelling of 669900 in words is "six hundred sixty-nine thousand, nine hundred".

Divisors: 1 2 3 4 5 6 7 10 11 12 14 15 20 21 22 25 28 29 30 33 35 42 44 50 55 58 60 66 70 75 77 84 87 100 105 110 116 132 140 145 150 154 165 174 175 203 210 220 231 275 290 300 308 319 330 348 350 385 406 420 435 462 525 550 580 609 638 660 700 725 770 812 825 870 924 957 1015 1050 1100 1155 1218 1276 1450 1540 1595 1650 1740 1914 1925 2030 2100 2175 2233 2310 2436 2900 3045 3190 3300 3828 3850 4060 4350 4466 4620 4785 5075 5775 6090 6380 6699 7700 7975 8700 8932 9570 10150 11165 11550 12180 13398 15225 15950 19140 20300 22330 23100 23925 26796 30450 31900 33495 44660 47850 55825 60900 66990 95700 111650 133980 167475 223300 334950 669900