79644820 has 24 divisors (see below), whose sum is σ = 167545728. Its totient is φ = 31802400.

The previous prime is 79644811. The next prime is 79644823. The reversal of 79644820 is 2844697.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79644823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9465 + ... + 15775.

It is an arithmetic number, because the mean of its divisors is an integer number (6981072).

Almost surely, 2^79644820 is an apocalyptic number.

It is an amenable number.

79644820 is an abundant number, since it is smaller than the sum of its proper divisors (87900908).

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

79644820 is a wasteful number, since it uses less digits than its factorization.

79644820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6951 (or 6949 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 79644820 is about 8924.3946573423. The cubic root of 79644820 is about 430.2483152023.

The spelling of 79644820 in words is "seventy-nine million, six hundred forty-four thousand, eight hundred twenty".