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69980 = 2253499
BaseRepresentation
bin10001000101011100
310112222212
4101011130
54214410
61255552
7411011
oct210534
9115885
1069980
1148639
12345b8
1325b11
141b708
1515b05
hex1115c

69980 has 12 divisors (see below), whose sum is σ = 147000. Its totient is φ = 27984.

The previous prime is 69959. The next prime is 69991. The reversal of 69980 is 8996.

69980 = T89 + T90 + ... + T103.

69980 = 902 + 912 + ... + 972.

It is a happy number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 69980.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1730 + ... + 1769.

It is an arithmetic number, because the mean of its divisors is an integer number (12250).

269980 is an apocalyptic number.

It is an amenable number.

69980 is an abundant number, since it is smaller than the sum of its proper divisors (77020).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73500).

69980 is a wasteful number, since it uses less digits than its factorization.

69980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508 (or 3506 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 69980 is about 264.5373319590. The cubic root of 69980 is about 41.2089275906.

The spelling of 69980 in words is "sixty-nine thousand, nine hundred eighty".

Divisors: 1 2 4 5 10 20 3499 6998 13996 17495 34990 69980