647664620 has 12 divisors (see below), whose sum is σ = 1360095744. Its totient is φ = 259065840.

The previous prime is 647664601. The next prime is 647664629. The reversal of 647664620 is 26466746.

It is not an unprimeable number, because it can be changed into a prime (647664629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16191596 + ... + 16191635.

It is an arithmetic number, because the mean of its divisors is an integer number (113341312).

Almost surely, 2^647664620 is an apocalyptic number.

It is an amenable number.

647664620 is an abundant number, since it is smaller than the sum of its proper divisors (712431124).

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

647664620 is a wasteful number, since it uses less digits than its factorization.

647664620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32383240 (or 32383238 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 41.

The square root of 647664620 is about 25449.2557847965. The cubic root of 647664620 is about 865.2004257853.

The spelling of 647664620 in words is "six hundred forty-seven million, six hundred sixty-four thousand, six hundred twenty".