646056164 has 24 divisors (see below), whose sum is σ = 1281651840. Its totient is φ = 282485664.

The previous prime is 646056139. The next prime is 646056197. The reversal of 646056164 is 461650646.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325964 + ... + 327939.

It is an arithmetic number, because the mean of its divisors is an integer number (53402160).

Almost surely, 2^646056164 is an apocalyptic number.

It is an amenable number.

646056164 is a deficient number, since it is larger than the sum of its proper divisors (635595676).

646056164 is a wasteful number, since it uses less digits than its factorization.

646056164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653939 (or 653937 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 646056164 is about 25417.6349017764. The cubic root of 646056164 is about 864.4835987965.

The spelling of 646056164 in words is "six hundred forty-six million, fifty-six thousand, one hundred sixty-four".