79644540 has 24 divisors (see below), whose sum is σ = 223004880. Its totient is φ = 21238528.

The previous prime is 79644511. The next prime is 79644563. The reversal of 79644540 is 4544697.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 663645 + ... + 663764.

It is an arithmetic number, because the mean of its divisors is an integer number (9291870).

Almost surely, 2^79644540 is an apocalyptic number.

It is an amenable number.

79644540 is an abundant number, since it is smaller than the sum of its proper divisors (143360340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79644540 is a wasteful number, since it uses less digits than its factorization.

79644540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327421 (or 1327419 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 79644540 is about 8924.3789699900. The cubic root of 79644540 is about 430.2478110069.

The spelling of 79644540 in words is "seventy-nine million, six hundred forty-four thousand, five hundred forty".