78556920 has 128 divisors (see below), whose sum is σ = 260850240. Its totient is φ = 18800640.

The previous prime is 78556913. The next prime is 78556921. The reversal of 78556920 is 2965587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78556921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57040 + ... + 58400.

Almost surely, 2^78556920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78556920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130425120).

78556920 is an abundant number, since it is smaller than the sum of its proper divisors (182293320).

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

78556920 is a wasteful number, since it uses less digits than its factorization.

78556920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425 (or 1421 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 78556920 is about 8863.2341726934. The cubic root of 78556920 is about 428.2803502859.

The spelling of 78556920 in words is "seventy-eight million, five hundred fifty-six thousand, nine hundred twenty".