664005236 has 12 divisors (see below), whose sum is σ = 1223167680. Its totient is φ = 314528760.

The previous prime is 664005233. The next prime is 664005263. The reversal of 664005236 is 632500466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664005233) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4368380 + ... + 4368531.

It is an arithmetic number, because the mean of its divisors is an integer number (101930640).

Almost surely, 2^664005236 is an apocalyptic number.

It is an amenable number.

664005236 is a deficient number, since it is larger than the sum of its proper divisors (559162444).

664005236 is a wasteful number, since it uses less digits than its factorization.

664005236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8736934 (or 8736932 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 664005236 is about 25768.2990513538. The cubic root of 664005236 is about 872.4164274378.

The spelling of 664005236 in words is "six hundred sixty-four million, five thousand, two hundred thirty-six".