649357864 has 16 divisors (see below), whose sum is σ = 1217848320. Its totient is φ = 324598320.

The previous prime is 649357859. The next prime is 649357883. The reversal of 649357864 is 468753946.

Its product of digits (4354560) is a multiple of the sum of its prime factors (20160).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37209 + ... + 51799.

It is an arithmetic number, because the mean of its divisors is an integer number (76115520).

Almost surely, 2^649357864 is an apocalyptic number.

It is an amenable number.

649357864 is a deficient number, since it is larger than the sum of its proper divisors (568490456).

649357864 is a wasteful number, since it uses less digits than its factorization.

649357864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20160 (or 20156 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 52.

The square root of 649357864 is about 25482.5011331306. The cubic root of 649357864 is about 865.9537583737.

The spelling of 649357864 in words is "six hundred forty-nine million, three hundred fifty-seven thousand, eight hundred sixty-four".