79728813 has 16 divisors (see below), whose sum is σ = 119204800. Its totient is φ = 52662960.

The previous prime is 79728809. The next prime is 79728823. The reversal of 79728813 is 31882797.

It is not a de Polignac number, because 79728813 - 2² = 79728809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79728823) 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, 10603 + ... + 16488.

It is an arithmetic number, because the mean of its divisors is an integer number (7450300).

Almost surely, 2^79728813 is an apocalyptic number.

It is an amenable number.

79728813 is a deficient number, since it is larger than the sum of its proper divisors (39475987).

79728813 is a wasteful number, since it uses less digits than its factorization.

79728813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27209 (or 27203 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 79728813 is about 8929.0992266857. The cubic root of 79728813 is about 430.3995079209.

The spelling of 79728813 in words is "seventy-nine million, seven hundred twenty-eight thousand, eight hundred thirteen".