64551664 has 60 divisors (see below), whose sum is σ = 136116040. Its totient is φ = 29566080.

The previous prime is 64551647. The next prime is 64551667. The reversal of 64551664 is 46615546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64551667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1058194 + ... + 1058254.

Almost surely, 2^64551664 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 64551664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68058020).

64551664 is an abundant number, since it is smaller than the sum of its proper divisors (71564376).

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

64551664 is a wasteful number, since it uses less digits than its factorization.

64551664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 141 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 64551664 is about 8034.4050184192. The cubic root of 64551664 is about 401.1460134970.

The spelling of 64551664 in words is "sixty-four million, five hundred fifty-one thousand, six hundred sixty-four".