646622624 has 24 divisors (see below), whose sum is σ = 1274545188. Its totient is φ = 322928640.

The previous prime is 646622617. The next prime is 646622651. The reversal of 646622624 is 426226646.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 646176400 + 446224 = 25420^2 + 668^2 .

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 3 ways as a sum of consecutive naturals, for example, 16544 + ... + 39584.

Almost surely, 2^646622624 is an apocalyptic number.

It is an amenable number.

646622624 is a deficient number, since it is larger than the sum of its proper divisors (627922564).

646622624 is a wasteful number, since it uses less digits than its factorization.

646622624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23928 (or 23920 counting only the distinct ones).

The product of its digits is 165888, while the sum is 38.

The square root of 646622624 is about 25428.7755112196. The cubic root of 646622624 is about 864.7361838168.

The spelling of 646622624 in words is "six hundred forty-six million, six hundred twenty-two thousand, six hundred twenty-four".