664251064 has 32 divisors (see below), whose sum is σ = 1330434720. Its totient is φ = 309815296.

The previous prime is 664251059. The next prime is 664251083. The reversal of 664251064 is 460152466.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

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, 6244 + ... + 36979.

It is an arithmetic number, because the mean of its divisors is an integer number (41576085).

Almost surely, 2^664251064 is an apocalyptic number.

It is an amenable number.

664251064 is an abundant number, since it is smaller than the sum of its proper divisors (666183656).

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

664251064 is a wasteful number, since it uses less digits than its factorization.

664251064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43359 (or 43355 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 664251064 is about 25773.0685794300. The cubic root of 664251064 is about 872.5240761494.

The spelling of 664251064 in words is "six hundred sixty-four million, two hundred fifty-one thousand, sixty-four".