79309864 has 8 divisors (see below), whose sum is σ = 148706010. Its totient is φ = 39654928.

The previous prime is 79309861. The next prime is 79309877. The reversal of 79309864 is 46890397.

It can be written as a sum of positive squares in only one way, i.e., 77968900 + 1340964 = 8830^2 + 1158^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (79309861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4956859 + ... + 4956874.

Almost surely, 2^79309864 is an apocalyptic number.

It is an amenable number.

79309864 is a deficient number, since it is larger than the sum of its proper divisors (69396146).

79309864 is a wasteful number, since it uses less digits than its factorization.

79309864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9913739 (or 9913735 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 79309864 is about 8905.6085698845. The cubic root of 79309864 is about 429.6443137617.

The spelling of 79309864 in words is "seventy-nine million, three hundred nine thousand, eight hundred sixty-four".