644351352 has 16 divisors (see below), whose sum is σ = 1610878440. Its totient is φ = 214783776.

The previous prime is 644351317. The next prime is 644351401. The reversal of 644351352 is 253153446.

It is a congruent number.

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, 13423963 + ... + 13424010.

Almost surely, 2^644351352 is an apocalyptic number.

It is an amenable number.

644351352 is an abundant number, since it is smaller than the sum of its proper divisors (966527088).

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

644351352 is a wasteful number, since it uses less digits than its factorization.

644351352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26847982 (or 26847978 counting only the distinct ones).

The product of its digits is 43200, while the sum is 33.

The square root of 644351352 is about 25384.0767411383. The cubic root of 644351352 is about 863.7225296424.

The spelling of 644351352 in words is "six hundred forty-four million, three hundred fifty-one thousand, three hundred fifty-two".