646663364 has 24 divisors (see below), whose sum is σ = 1168046880. Its totient is φ = 313099776.

The previous prime is 646663343. The next prime is 646663403. The reversal of 646663364 is 463366646.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4637 + ... + 36260.

It is an arithmetic number, because the mean of its divisors is an integer number (48668620).

Almost surely, 2^646663364 is an apocalyptic number.

It is an amenable number.

646663364 is a deficient number, since it is larger than the sum of its proper divisors (521383516).

646663364 is a wasteful number, since it uses less digits than its factorization.

646663364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41027 (or 41025 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 44.

The square root of 646663364 is about 25429.5765595890. The cubic root of 646663364 is about 864.7543441322.

The spelling of 646663364 in words is "six hundred forty-six million, six hundred sixty-three thousand, three hundred sixty-four".