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666672 = 243171943
BaseRepresentation
bin10100010110000110000
31020212111120
42202300300
5132313142
622142240
75444436
oct2426060
91225446
10666672
11415976
12281980
131a45a6
14134d56
15d27ec
hexa2c30

666672 has 80 divisors (see below), whose sum is σ = 1964160. Its totient is φ = 193536.

The previous prime is 666671. The next prime is 666683. The reversal of 666672 is 276666.

Its product of digits (18144) is a multiple of the sum of its prime divisors (84).

It is not an unprimeable number, because it can be changed into a prime (666671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15483 + ... + 15525.

It is an arithmetic number, because the mean of its divisors is an integer number (24552).

2666672 is an apocalyptic number.

It is a pronic number, being equal to 816×817.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (982080).

666672 is an abundant number, since it is smaller than the sum of its proper divisors (1297488).

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

666672 is a wasteful number, since it uses less digits than its factorization.

666672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 84 counting only the distinct ones).

The product of its digits is 18144, while the sum is 33.

The square root of 666672 is about 816.4998469075. The cubic root of 666672 is about 87.3582794278.

The spelling of 666672 in words is "six hundred sixty-six thousand, six hundred seventy-two".

Divisors: 1 2 3 4 6 8 12 16 17 19 24 34 38 43 48 51 57 68 76 86 102 114 129 136 152 172 204 228 258 272 304 323 344 408 456 516 646 688 731 816 817 912 969 1032 1292 1462 1634 1938 2064 2193 2451 2584 2924 3268 3876 4386 4902 5168 5848 6536 7752 8772 9804 11696 13072 13889 15504 17544 19608 27778 35088 39216 41667 55556 83334 111112 166668 222224 333336 666672