78977928 has 64 divisors (see below), whose sum is σ = 204272640. Its totient is φ = 25429824.

The previous prime is 78977893. The next prime is 78977939. The reversal of 78977928 is 82977987.

It is a super-2 number, since 2×78977928² = 12475026222346368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105925 + ... + 106667.

It is an arithmetic number, because the mean of its divisors is an integer number (3191760).

Almost surely, 2^78977928 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 78977928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102136320).

78977928 is an abundant number, since it is smaller than the sum of its proper divisors (125294712).

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

78977928 is a wasteful number, since it uses less digits than its factorization.

78977928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 894 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 57.

The square root of 78977928 is about 8886.9526835693. The cubic root of 78977928 is about 429.0440780396.

The spelling of 78977928 in words is "seventy-eight million, nine hundred seventy-seven thousand, nine hundred twenty-eight".