79640646 has 8 divisors (see below), whose sum is σ = 159281304. Its totient is φ = 26546880.

The previous prime is 79640633. The next prime is 79640657. The reversal of 79640646 is 64604697.

It is a sphenic number, since it is the product of 3 distinct primes.

79640646 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 79640598 and 79640607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6636715 + ... + 6636726.

It is an arithmetic number, because the mean of its divisors is an integer number (19910163).

Almost surely, 2^79640646 is an apocalyptic number.

79640646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

79640646 is a wasteful number, since it uses less digits than its factorization.

79640646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13273446.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 79640646 is about 8924.1608008821. The cubic root of 79640646 is about 430.2407989661.

The spelling of 79640646 in words is "seventy-nine million, six hundred forty thousand, six hundred forty-six".