79021057 has 12 divisors (see below), whose sum is σ = 85389040. Its totient is φ = 72885960.

The previous prime is 79020983. The next prime is 79021069. The reversal of 79021057 is 75012097.

It is a de Polignac number, because none of the positive numbers 2^k-79021057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79021097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 253932 + ... + 254242.

Almost surely, 2^79021057 is an apocalyptic number.

It is an amenable number.

79021057 is a deficient number, since it is larger than the sum of its proper divisors (6367983).

79021057 is an equidigital number, since it uses as much as digits as its factorization.

79021057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 79021057 is about 8889.3788871889. The cubic root of 79021057 is about 429.1221626184.

The spelling of 79021057 in words is "seventy-nine million, twenty-one thousand, fifty-seven".