64044560 has 20 divisors (see below), whose sum is σ = 148903788. Its totient is φ = 25617792.

The previous prime is 64044553. The next prime is 64044599. The reversal of 64044560 is 6544046.

It can be written as a sum of positive squares in 2 ways, for example, as 18939904 + 45104656 = 4352^2 + 6716^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 400199 + ... + 400358.

Almost surely, 2^64044560 is an apocalyptic number.

It is an amenable number.

64044560 is an abundant number, since it is smaller than the sum of its proper divisors (84859228).

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

64044560 is a wasteful number, since it uses less digits than its factorization.

64044560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800570 (or 800564 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 64044560 is about 8002.7845154046. The cubic root of 64044560 is about 400.0928117966.

The spelling of 64044560 in words is "sixty-four million, forty-four thousand, five hundred sixty".