664515424 has 48 divisors (see below), whose sum is σ = 1379911680. Its totient is φ = 314133120.

The previous prime is 664515403. The next prime is 664515433. The reversal of 664515424 is 424515466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451009 + ... + 452479.

It is an arithmetic number, because the mean of its divisors is an integer number (28748160).

Almost surely, 2^664515424 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 664515424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689955840).

664515424 is an abundant number, since it is smaller than the sum of its proper divisors (715396256).

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

664515424 is a wasteful number, since it uses less digits than its factorization.

664515424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243 (or 2235 counting only the distinct ones).

The product of its digits is 115200, while the sum is 37.

The square root of 664515424 is about 25778.1966785887. The cubic root of 664515424 is about 872.6398104375.

The spelling of 664515424 in words is "six hundred sixty-four million, five hundred fifteen thousand, four hundred twenty-four".