644204464 has 40 divisors (see below), whose sum is σ = 1297760688. Its totient is φ = 309534720.

The previous prime is 644204437. The next prime is 644204489. The reversal of 644204464 is 464402446.

644204464 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×644204464³ (a number of 27 digits) contains 333 as substring.

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, 36624 + ... + 51280.

Almost surely, 2^644204464 is an apocalyptic number.

It is an amenable number.

644204464 is an abundant number, since it is smaller than the sum of its proper divisors (653556224).

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

644204464 is a wasteful number, since it uses less digits than its factorization.

644204464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14773 (or 14767 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 34.

The square root of 644204464 is about 25381.1832663491. The cubic root of 644204464 is about 863.6568925143.

The spelling of 644204464 in words is "six hundred forty-four million, two hundred four thousand, four hundred sixty-four".