78556900 has 18 divisors (see below), whose sum is σ = 170468690. Its totient is φ = 31422720.

The previous prime is 78556873. The next prime is 78556913. The reversal of 78556900 is 965587.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 128164 + 78428736 = 358^2 + 8856^2 .

It is a super-2 number, since 2×78556900² = 12342373075220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 392685 + ... + 392884.

Almost surely, 2^78556900 is an apocalyptic number.

It is an amenable number.

78556900 is an abundant number, since it is smaller than the sum of its proper divisors (91911790).

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

78556900 is a wasteful number, since it uses less digits than its factorization.

78556900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785583 (or 785576 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 78556900 is about 8863.2330444370. The cubic root of 78556900 is about 428.2803139403.

The spelling of 78556900 in words is "seventy-eight million, five hundred fifty-six thousand, nine hundred".