649376988 has 48 divisors (see below), whose sum is σ = 1662577056. Its totient is φ = 196035840.

The previous prime is 649376953. The next prime is 649377037. The reversal of 649376988 is 889673946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31003 + ... + 47538.

It is an arithmetic number, because the mean of its divisors is an integer number (34637022).

Almost surely, 2^649376988 is an apocalyptic number.

It is an amenable number.

649376988 is an abundant number, since it is smaller than the sum of its proper divisors (1013200068).

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

649376988 is a wasteful number, since it uses less digits than its factorization.

649376988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78614 (or 78612 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 60.

The square root of 649376988 is about 25482.8763682595. The cubic root of 649376988 is about 865.9622592523.

The spelling of 649376988 in words is "six hundred forty-nine million, three hundred seventy-six thousand, nine hundred eighty-eight".