646021164 has 48 divisors (see below), whose sum is σ = 1558460288. Its totient is φ = 208147968.

The previous prime is 646021163. The next prime is 646021193. The reversal of 646021164 is 461120646.

It is not an unprimeable number, because it can be changed into a prime (646021163) 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, 43599 + ... + 56505.

Almost surely, 2^646021164 is an apocalyptic number.

It is an amenable number.

646021164 is an abundant number, since it is smaller than the sum of its proper divisors (912439124).

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

646021164 is a wasteful number, since it uses less digits than its factorization.

646021164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13054 (or 13052 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 646021164 is about 25416.9463940891. The cubic root of 646021164 is about 864.4679874229.

The spelling of 646021164 in words is "six hundred forty-six million, twenty-one thousand, one hundred sixty-four".