664036506 has 24 divisors (see below), whose sum is σ = 1644281184. Its totient is φ = 189724680.

The previous prime is 664036501. The next prime is 664036537. The reversal of 664036506 is 605630466.

664036506 is a `hidden beast` number, since 6 + 640 + 3 + 6 + 5 + 0 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (664036501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2634940 + ... + 2635191.

It is an arithmetic number, because the mean of its divisors is an integer number (68511716).

Almost surely, 2^664036506 is an apocalyptic number.

664036506 is an abundant number, since it is smaller than the sum of its proper divisors (980244678).

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

664036506 is a wasteful number, since it uses less digits than its factorization.

664036506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270146 (or 5270143 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 664036506 is about 25768.9057974917. The cubic root of 664036506 is about 872.4301221257.

The spelling of 664036506 in words is "six hundred sixty-four million, thirty-six thousand, five hundred six".