664392620 has 24 divisors (see below), whose sum is σ = 1440233088. Its totient is φ = 257184000.

The previous prime is 664392593. The next prime is 664392643. The reversal of 664392620 is 26293466.

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 7 ways as a sum of consecutive naturals, for example, 535181 + ... + 536420.

It is an arithmetic number, because the mean of its divisors is an integer number (60009712).

Almost surely, 2^664392620 is an apocalyptic number.

It is an amenable number.

664392620 is an abundant number, since it is smaller than the sum of its proper divisors (775840468).

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

664392620 is a wasteful number, since it uses less digits than its factorization.

664392620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071641 (or 1071639 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 664392620 is about 25775.8146331013. The cubic root of 664392620 is about 872.5860518351.

The spelling of 664392620 in words is "six hundred sixty-four million, three hundred ninety-two thousand, six hundred twenty".