664364500 has 24 divisors (see below), whose sum is σ = 1450973160. Its totient is φ = 265745600.

The previous prime is 664364473. The next prime is 664364501. The reversal of 664364500 is 5463466.

It can be written as a sum of positive squares in 4 ways, for example, as 1507984 + 662856516 = 1228^2 + 25746^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664364501) 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, 663865 + ... + 664864.

It is an arithmetic number, because the mean of its divisors is an integer number (60457215).

Almost surely, 2^664364500 is an apocalyptic number.

It is an amenable number.

664364500 is an abundant number, since it is smaller than the sum of its proper divisors (786608660).

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

664364500 is a wasteful number, since it uses less digits than its factorization.

664364500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328748 (or 1328736 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 664364500 is about 25775.2691547537. The cubic root of 664364500 is about 872.5737411094.

The spelling of 664364500 in words is "six hundred sixty-four million, three hundred sixty-four thousand, five hundred".