664913900 has 72 divisors (see below), whose sum is σ = 1720723200. Its totient is φ = 218053440.

The previous prime is 664913897. The next prime is 664913917. The reversal of 664913900 is 9319466.

It is a super-2 number, since 2×664913900² = 884220988826420000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4550 + ... + 36749.

Almost surely, 2^664913900 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 664913900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860361600).

664913900 is an abundant number, since it is smaller than the sum of its proper divisors (1055809300).

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

664913900 is a wasteful number, since it uses less digits than its factorization.

664913900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41343 (or 41336 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 664913900 is about 25785.9244550200. The cubic root of 664913900 is about 872.8142014434.

The spelling of 664913900 in words is "six hundred sixty-four million, nine hundred thirteen thousand, nine hundred".