649981928 has 16 divisors (see below), whose sum is σ = 1219250880. Its totient is φ = 324848368.

The previous prime is 649981889. The next prime is 649981939. The reversal of 649981928 is 829189946.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2975 + ... + 36177.

It is an arithmetic number, because the mean of its divisors is an integer number (76203180).

Almost surely, 2^649981928 is an apocalyptic number.

It is an amenable number.

649981928 is a deficient number, since it is larger than the sum of its proper divisors (569268952).

649981928 is a wasteful number, since it uses less digits than its factorization.

649981928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35656 (or 35652 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 56.

The square root of 649981928 is about 25494.7431444210. The cubic root of 649981928 is about 866.2310772290.

The spelling of 649981928 in words is "six hundred forty-nine million, nine hundred eighty-one thousand, nine hundred twenty-eight".