79644539 has 16 divisors (see below), whose sum is σ = 87218208. Its totient is φ = 72291072.

The previous prime is 79644511. The next prime is 79644563. The reversal of 79644539 is 93544697.

79644539 = 1410² + 1411² + ... + 1448².

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 79644539 - 2¹² = 79640443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79644493 and 79644502.

It is not an unprimeable number, because it can be changed into a prime (79644569) 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, 350744 + ... + 350970.

It is an arithmetic number, because the mean of its divisors is an integer number (5451138).

Almost surely, 2^79644539 is an apocalyptic number.

79644539 is a deficient number, since it is larger than the sum of its proper divisors (7573669).

79644539 is a wasteful number, since it uses less digits than its factorization.

79644539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574.

The product of its digits is 816480, while the sum is 47.

The square root of 79644539 is about 8924.3789139637. The cubic root of 79644539 is about 430.2478092062.

The spelling of 79644539 in words is "seventy-nine million, six hundred forty-four thousand, five hundred thirty-nine".