79512889 has 9 divisors (see below), whose sum is σ = 82060461. Its totient is φ = 77042880.

The previous prime is 79512887. The next prime is 79512907. The reversal of 79512889 is 98821597.

The square root of 79512889 is 8917.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 34515625 + 44997264 = 5875^2 + 6708^2 .

It is not a de Polignac number, because 79512889 - 2¹ = 79512887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79512887) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 329809 + ... + 330049.

It is an arithmetic number, because the mean of its divisors is an integer number (9117829).

Almost surely, 2^79512889 is an apocalyptic number.

79512889 is the 8917-th square number.

79512889 is the 4459-th centered octagonal number.

It is an amenable number.

79512889 is a deficient number, since it is larger than the sum of its proper divisors (2547572).

79512889 is an frugal number, since it uses more digits than its factorization.

79512889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 278 counting only the distinct ones).

The product of its digits is 362880, while the sum is 49.

The cubic root of 79512889 is about 430.0106162874.

Multiplying 79512889 by its sum of digits (49), we get a square (3896131561 = 62419²).

The spelling of 79512889 in words is "seventy-nine million, five hundred twelve thousand, eight hundred eighty-nine".