78112980 has 72 divisors (see below), whose sum is σ = 258489504. Its totient is φ = 18936000.

The previous prime is 78112973. The next prime is 78112981. The reversal of 78112980 is 8921187.

It is a super-2 number, since 2×78112980² = 12203275288960800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78112981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17746 + ... + 21705.

It is an arithmetic number, because the mean of its divisors is an integer number (3590132).

Almost surely, 2^78112980 is an apocalyptic number.

It is an amenable number.

78112980 is an abundant number, since it is smaller than the sum of its proper divisors (180376524).

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

78112980 is a wasteful number, since it uses less digits than its factorization.

78112980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39477 (or 39472 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 78112980 is about 8838.1547847953. The cubic root of 78112980 is about 427.4720613731.

The spelling of 78112980 in words is "seventy-eight million, one hundred twelve thousand, nine hundred eighty".