649639576 has 8 divisors (see below), whose sum is σ = 1218074220. Its totient is φ = 324819784.

The previous prime is 649639567. The next prime is 649639607. The reversal of 649639576 is 675936946.

649639576 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40602466 + ... + 40602481.

Almost surely, 2^649639576 is an apocalyptic number.

It is an amenable number.

649639576 is a deficient number, since it is larger than the sum of its proper divisors (568434644).

649639576 is a wasteful number, since it uses less digits than its factorization.

649639576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81204953 (or 81204949 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 55.

The square root of 649639576 is about 25488.0280916355. The cubic root of 649639576 is about 866.0789663212.

The spelling of 649639576 in words is "six hundred forty-nine million, six hundred thirty-nine thousand, five hundred seventy-six".