644235112 has 16 divisors (see below), whose sum is σ = 1210117860. Its totient is φ = 321537024.

The previous prime is 644235107. The next prime is 644235121. The reversal of 644235112 is 211532446.

It can be written as a sum of positive squares in 2 ways, for example, as 546343876 + 97891236 = 23374^2 + 9894^2 .

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, 67833 + ... + 76744.

Almost surely, 2^644235112 is an apocalyptic number.

It is an amenable number.

644235112 is a deficient number, since it is larger than the sum of its proper divisors (565882748).

644235112 is a wasteful number, since it uses less digits than its factorization.

644235112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145140 (or 145136 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 644235112 is about 25381.7870135261. The cubic root of 644235112 is about 863.6705884437.

Adding to 644235112 its reverse (211532446), we get a palindrome (855767558).

The spelling of 644235112 in words is "six hundred forty-four million, two hundred thirty-five thousand, one hundred twelve".