646913729924 has 48 divisors (see below), whose sum is σ = 1411709523840. Its totient is φ = 251997634560.

The previous prime is 646913729909. The next prime is 646913729927. The reversal of 646913729924 is 429927319646.

It is not an unprimeable number, because it can be changed into a prime (646913729927) 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, 1495172 + ... + 1878660.

It is an arithmetic number, because the mean of its divisors is an integer number (29410615080).

Almost surely, 2^646913729924 is an apocalyptic number.

It is an amenable number.

646913729924 is an abundant number, since it is smaller than the sum of its proper divisors (764795793916).

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

646913729924 is a wasteful number, since it uses less digits than its factorization.

646913729924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388988 (or 388986 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 62.

The spelling of 646913729924 in words is "six hundred forty-six billion, nine hundred thirteen million, seven hundred twenty-nine thousand, nine hundred twenty-four".