646505044 has 12 divisors (see below), whose sum is σ = 1142368864. Its totient is φ = 320113944.

The previous prime is 646504997. The next prime is 646505047. The reversal of 646505044 is 440505646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646505047) 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, 784182 + ... + 785005.

Almost surely, 2^646505044 is an apocalyptic number.

It is an amenable number.

646505044 is a deficient number, since it is larger than the sum of its proper divisors (495863820).

646505044 is a wasteful number, since it uses less digits than its factorization.

646505044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569294 (or 1569292 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 646505044 is about 25426.4634583734. The cubic root of 646505044 is about 864.6837669252.

The spelling of 646505044 in words is "six hundred forty-six million, five hundred five thousand, forty-four".