649637676 has 18 divisors (see below), whose sum is σ = 1642139772. Its totient is φ = 216545880.

The previous prime is 649637647. The next prime is 649637687. The reversal of 649637676 is 676736946.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×649637676² = 844058220157361952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9022710 + ... + 9022781.

Almost surely, 2^649637676 is an apocalyptic number.

It is an amenable number.

649637676 is an abundant number, since it is smaller than the sum of its proper divisors (992502096).

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

649637676 is a wasteful number, since it uses less digits than its factorization.

649637676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18045501 (or 18045496 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 54.

The square root of 649637676 is about 25487.9908192074. The cubic root of 649637676 is about 866.0781219804.

The spelling of 649637676 in words is "six hundred forty-nine million, six hundred thirty-seven thousand, six hundred seventy-six".