646621324 has 24 divisors (see below), whose sum is σ = 1163656368. Its totient is φ = 314170560.

The previous prime is 646621277. The next prime is 646621351. The reversal of 646621324 is 423126646.

It is a self number, because there is not a number n which added to its sum of digits gives 646621324.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136947 + ... + 141589.

It is an arithmetic number, because the mean of its divisors is an integer number (48485682).

Almost surely, 2^646621324 is an apocalyptic number.

It is an amenable number.

646621324 is a deficient number, since it is larger than the sum of its proper divisors (517035044).

646621324 is a wasteful number, since it uses less digits than its factorization.

646621324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5625 (or 5623 counting only the distinct ones).

The product of its digits is 41472, while the sum is 34.

The square root of 646621324 is about 25428.7499496141. The cubic root of 646621324 is about 864.7356043146.

The spelling of 646621324 in words is "six hundred forty-six million, six hundred twenty-one thousand, three hundred twenty-four".