644153416 has 32 divisors (see below), whose sum is σ = 1243851840. Its totient is φ = 312556608.

The previous prime is 644153407. The next prime is 644153483. The reversal of 644153416 is 614351446.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48045 + ... + 59971.

It is an arithmetic number, because the mean of its divisors is an integer number (38870370).

Almost surely, 2^644153416 is an apocalyptic number.

It is an amenable number.

644153416 is a deficient number, since it is larger than the sum of its proper divisors (599698424).

644153416 is a wasteful number, since it uses less digits than its factorization.

644153416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12133 (or 12129 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 644153416 is about 25380.1776195518. The cubic root of 644153416 is about 863.6340793009.

The spelling of 644153416 in words is "six hundred forty-four million, one hundred fifty-three thousand, four hundred sixteen".