649865464 has 16 divisors (see below), whose sum is σ = 1218772800. Its totient is φ = 324859392.

The previous prime is 649865459. The next prime is 649865473. The reversal of 649865464 is 464568946.

It is a happy number.

649865464 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 54489 + ... + 65335.

It is an arithmetic number, because the mean of its divisors is an integer number (76173300).

Almost surely, 2^649865464 is an apocalyptic number.

It is an amenable number.

649865464 is a deficient number, since it is larger than the sum of its proper divisors (568907336).

649865464 is a wasteful number, since it uses less digits than its factorization.

649865464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18342 (or 18338 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 52.

The square root of 649865464 is about 25492.4589633876. The cubic root of 649865464 is about 866.1793369380.

The spelling of 649865464 in words is "six hundred forty-nine million, eight hundred sixty-five thousand, four hundred sixty-four".