64644344 has 16 divisors (see below), whose sum is σ = 121293720. Its totient is φ = 32299360.

The previous prime is 64644311. The next prime is 64644373. The reversal of 64644344 is 44344646.

It is a super-2 number, since 2×64644344² = 8357782422380672, which contains 22 as substring.

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, 19427 + ... + 22509.

Almost surely, 2^64644344 is an apocalyptic number.

It is an amenable number.

64644344 is a deficient number, since it is larger than the sum of its proper divisors (56649376).

64644344 is a wasteful number, since it uses less digits than its factorization.

64644344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5710 (or 5706 counting only the distinct ones).

The product of its digits is 110592, while the sum is 35.

The square root of 64644344 is about 8040.1706449552. The cubic root of 64644344 is about 401.3379033805.

The spelling of 64644344 in words is "sixty-four million, six hundred forty-four thousand, three hundred forty-four".