64037664 has 72 divisors (see below), whose sum is σ = 186378192. Its totient is φ = 20845440.

The previous prime is 64037651. The next prime is 64037683. The reversal of 64037664 is 46673046.

64037664 is a `hidden beast` number, since 640 + 3 + 7 + 6 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 9799 + ... + 14969.

It is an arithmetic number, because the mean of its divisors is an integer number (2588586).

Almost surely, 2^64037664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64037664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93189096).

64037664 is an abundant number, since it is smaller than the sum of its proper divisors (122340528).

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

64037664 is a wasteful number, since it uses less digits than its factorization.

64037664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5230 (or 5219 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 64037664 is about 8002.3536537696. The cubic root of 64037664 is about 400.0784512792.

The spelling of 64037664 in words is "sixty-four million, thirty-seven thousand, six hundred sixty-four".