64744438 has 24 divisors (see below), whose sum is σ = 112374360. Its totient is φ = 27878400.

The previous prime is 64744411. The next prime is 64744489. The reversal of 64744438 is 83444746.

It is a self number, because there is not a number n which added to its sum of digits gives 64744438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2443 + ... + 11638.

It is an arithmetic number, because the mean of its divisors is an integer number (4682265).

Almost surely, 2^64744438 is an apocalyptic number.

64744438 is a deficient number, since it is larger than the sum of its proper divisors (47629922).

64744438 is a wasteful number, since it uses less digits than its factorization.

64744438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14124 (or 14113 counting only the distinct ones).

The product of its digits is 258048, while the sum is 40.

The square root of 64744438 is about 8046.3928564295. The cubic root of 64744438 is about 401.5449377362.

The spelling of 64744438 in words is "sixty-four million, seven hundred forty-four thousand, four hundred thirty-eight".