664295520 has 192 divisors, whose sum is σ = 2405362176. Its totient is φ = 150958080.

The previous prime is 664295507. The next prime is 664295543. The reversal of 664295520 is 25592466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 708492 + ... + 709428.

It is an arithmetic number, because the mean of its divisors is an integer number (12527928).

Almost surely, 2^664295520 is an apocalyptic number.

664295520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664295520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1202681088).

664295520 is an abundant number, since it is smaller than the sum of its proper divisors (1741066656).

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

664295520 is a wasteful number, since it uses less digits than its factorization.

664295520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173 (or 1165 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 664295520 is about 25773.9310156600. The cubic root of 664295520 is about 872.5435407099.

The spelling of 664295520 in words is "six hundred sixty-four million, two hundred ninety-five thousand, five hundred twenty".