649977964 has 24 divisors (see below), whose sum is σ = 1173115328. Its totient is φ = 314876160.

The previous prime is 649977941. The next prime is 649977989. The reversal of 649977964 is 469779946.

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, 26557 + ... + 44779.

Almost surely, 2^649977964 is an apocalyptic number.

It is an amenable number.

649977964 is a deficient number, since it is larger than the sum of its proper divisors (523137364).

649977964 is a wasteful number, since it uses less digits than its factorization.

649977964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18505 (or 18503 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 61.

The square root of 649977964 is about 25494.6654027857. The cubic root of 649977964 is about 866.2293162842.

The spelling of 649977964 in words is "six hundred forty-nine million, nine hundred seventy-seven thousand, nine hundred sixty-four".