647640164 has 12 divisors (see below), whose sum is σ = 1182647424. Its totient is φ = 309740904.

The previous prime is 647640163. The next prime is 647640173. The reversal of 647640164 is 461046746.

It is not an unprimeable number, because it can be changed into a prime (647640163) 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 3 ways as a sum of consecutive naturals, for example, 3519692 + ... + 3519875.

It is an arithmetic number, because the mean of its divisors is an integer number (98553952).

Almost surely, 2^647640164 is an apocalyptic number.

It is an amenable number.

647640164 is a deficient number, since it is larger than the sum of its proper divisors (535007260).

647640164 is a wasteful number, since it uses less digits than its factorization.

647640164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7039594 (or 7039592 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 647640164 is about 25448.7752946974. The cubic root of 647640164 is about 865.1895355769.

The spelling of 647640164 in words is "six hundred forty-seven million, six hundred forty thousand, one hundred sixty-four".