644035112 has 16 divisors (see below), whose sum is σ = 1380075360. Its totient is φ = 276015024.

The previous prime is 644035099. The next prime is 644035129. The reversal of 644035112 is 211530446.

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, 5750258 + ... + 5750369.

It is an arithmetic number, because the mean of its divisors is an integer number (86254710).

Almost surely, 2^644035112 is an apocalyptic number.

It is an amenable number.

644035112 is an abundant number, since it is smaller than the sum of its proper divisors (736040248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644035112 is a wasteful number, since it uses less digits than its factorization.

644035112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11500640 (or 11500636 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 644035112 is about 25377.8468747843. The cubic root of 644035112 is about 863.5812049291.

Adding to 644035112 its reverse (211530446), we get a palindrome (855565558).

The spelling of 644035112 in words is "six hundred forty-four million, thirty-five thousand, one hundred twelve".