64715664 has 80 divisors (see below), whose sum is σ = 184974272. Its totient is φ = 19367424.

The previous prime is 64715647. The next prime is 64715683. The reversal of 64715664 is 46651746.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21687 + ... + 24489.

Almost surely, 2^64715664 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 64715664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92487136).

64715664 is an abundant number, since it is smaller than the sum of its proper divisors (120258608).

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

64715664 is a wasteful number, since it uses less digits than its factorization.

64715664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864 (or 2858 counting only the distinct ones).

The product of its digits is 120960, while the sum is 39.

The square root of 64715664 is about 8044.6046515662. The cubic root of 64715664 is about 401.4854434823.

The spelling of 64715664 in words is "sixty-four million, seven hundred fifteen thousand, six hundred sixty-four".