79700721 has 16 divisors (see below), whose sum is σ = 111341568. Its totient is φ = 50648400.

The previous prime is 79700713. The next prime is 79700723. The reversal of 79700721 is 12700797.

It is not a de Polignac number, because 79700721 - 2³ = 79700713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79700723) 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, 165 + ... + 12626.

It is an arithmetic number, because the mean of its divisors is an integer number (6958848).

Almost surely, 2^79700721 is an apocalyptic number.

It is an amenable number.

79700721 is a deficient number, since it is larger than the sum of its proper divisors (31640847).

79700721 is a wasteful number, since it uses less digits than its factorization.

79700721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12892.

The product of its (nonzero) digits is 6174, while the sum is 33.

The square root of 79700721 is about 8927.5260290855. The cubic root of 79700721 is about 430.3489523654.

The spelling of 79700721 in words is "seventy-nine million, seven hundred thousand, seven hundred twenty-one".