664520896 has 112 divisors (see below), whose sum is σ = 1511157760. Its totient is φ = 287400960.

The previous prime is 664520891. The next prime is 664520911. The reversal of 664520896 is 698025466.

It is a super-3 number, since 3×664520896³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (664520891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2007451 + ... + 2007781.

It is an arithmetic number, because the mean of its divisors is an integer number (13492480).

Almost surely, 2^664520896 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 664520896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (755578880).

664520896 is an abundant number, since it is smaller than the sum of its proper divisors (846636864).

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

664520896 is a wasteful number, since it uses less digits than its factorization.

664520896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 664520896 is about 25778.3028145764. The cubic root of 664520896 is about 872.6422057027.

The spelling of 664520896 in words is "six hundred sixty-four million, five hundred twenty thousand, eight hundred ninety-six".