64917664 has 48 divisors (see below), whose sum is σ = 148490496. Its totient is φ = 27360000.

The previous prime is 64917613. The next prime is 64917667. The reversal of 64917664 is 46671946.

It is a self number, because there is not a number n which added to its sum of digits gives 64917664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64917667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11289 + ... + 16039.

It is an arithmetic number, because the mean of its divisors is an integer number (3093552).

Almost surely, 2^64917664 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 64917664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74245248).

64917664 is an abundant number, since it is smaller than the sum of its proper divisors (83572832).

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

64917664 is a wasteful number, since it uses less digits than its factorization.

64917664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4829 (or 4821 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 64917664 is about 8057.1498682847. The cubic root of 64917664 is about 401.9027346507.

The spelling of 64917664 in words is "sixty-four million, nine hundred seventeen thousand, six hundred sixty-four".