79321257 has 12 divisors (see below), whose sum is σ = 120605680. Its totient is φ = 50097528.

The previous prime is 79321247. The next prime is 79321261. The reversal of 79321257 is 75212397.

It is not a de Polignac number, because 79321257 - 2⁴ = 79321241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79321217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231763 + ... + 232104.

Almost surely, 2^79321257 is an apocalyptic number.

It is an amenable number.

79321257 is a deficient number, since it is larger than the sum of its proper divisors (41284423).

79321257 is a wasteful number, since it uses less digits than its factorization.

79321257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463892 (or 463889 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 79321257 is about 8906.2481999998. The cubic root of 79321257 is about 429.6648858278.

The spelling of 79321257 in words is "seventy-nine million, three hundred twenty-one thousand, two hundred fifty-seven".