79720578 has 32 divisors (see below), whose sum is σ = 202465920. Its totient is φ = 22777200.

The previous prime is 79720577. The next prime is 79720583. The reversal of 79720578 is 87502797.

79720578 is a `hidden beast` number, since 7 + 9 + 72 + 0 + 578 = 666.

It is not an unprimeable number, because it can be changed into a prime (79720577) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105073 + ... + 105828.

It is an arithmetic number, because the mean of its divisors is an integer number (6327060).

Almost surely, 2^79720578 is an apocalyptic number.

79720578 is an abundant number, since it is smaller than the sum of its proper divisors (122745342).

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

79720578 is a wasteful number, since it uses less digits than its factorization.

79720578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210919 (or 210913 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 79720578 is about 8928.6380820369. The cubic root of 79720578 is about 430.3846890959.

The spelling of 79720578 in words is "seventy-nine million, seven hundred twenty thousand, five hundred seventy-eight".