79126857 has 12 divisors (see below), whose sum is σ = 121017780. Its totient is φ = 49648128.

The previous prime is 79126841. The next prime is 79126889. The reversal of 79126857 is 75862197.

It can be written as a sum of positive squares in 2 ways, for example, as 21427641 + 57699216 = 4629^2 + 7596^2 .

It is not a de Polignac number, because 79126857 - 2⁴ = 79126841 is a prime.

It is a super-2 number, since 2×79126857² = 12522118997396898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79126057) 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, 258432 + ... + 258737.

It is an arithmetic number, because the mean of its divisors is an integer number (10084815).

Almost surely, 2^79126857 is an apocalyptic number.

It is an amenable number.

79126857 is a deficient number, since it is larger than the sum of its proper divisors (41890923).

79126857 is a wasteful number, since it uses less digits than its factorization.

79126857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517192 (or 517189 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 79126857 is about 8895.3278185798. The cubic root of 79126857 is about 429.3135920901.

The spelling of 79126857 in words is "seventy-nine million, one hundred twenty-six thousand, eight hundred fifty-seven".