77925978 has 48 divisors (see below), whose sum is σ = 189745920. Its totient is φ = 22933152.

The previous prime is 77925941. The next prime is 77925983. The reversal of 77925978 is 87952977.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1858 + ... + 12621.

It is an arithmetic number, because the mean of its divisors is an integer number (3953040).

Almost surely, 2^77925978 is an apocalyptic number.

77925978 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

77925978 is an abundant number, since it is smaller than the sum of its proper divisors (111819942).

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

77925978 is a wasteful number, since it uses less digits than its factorization.

77925978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14523 (or 14520 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The square root of 77925978 is about 8827.5692010881. The cubic root of 77925978 is about 427.1306669558.

The spelling of 77925978 in words is "seventy-seven million, nine hundred twenty-five thousand, nine hundred seventy-eight".