644251112 has 32 divisors (see below), whose sum is σ = 1240937280. Its totient is φ = 313393920.

The previous prime is 644251099. The next prime is 644251123. The reversal of 644251112 is 211152446.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86912 + ... + 94032.

It is an arithmetic number, because the mean of its divisors is an integer number (38779290).

Almost surely, 2^644251112 is an apocalyptic number.

It is an amenable number.

644251112 is a deficient number, since it is larger than the sum of its proper divisors (596686168).

644251112 is a wasteful number, since it uses less digits than its factorization.

644251112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7433 (or 7429 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 644251112 is about 25382.1021982026. The cubic root of 644251112 is about 863.6777383257.

The spelling of 644251112 in words is "six hundred forty-four million, two hundred fifty-one thousand, one hundred twelve".