646624084 has 6 divisors (see below), whose sum is σ = 1131592154. Its totient is φ = 323312040.

The previous prime is 646624063. The next prime is 646624123. The reversal of 646624084 is 480426646.

It can be written as a sum of positive squares in only one way, i.e., 498271684 + 148352400 = 22322^2 + 12180^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80828007 + ... + 80828014.

Almost surely, 2^646624084 is an apocalyptic number.

It is an amenable number.

646624084 is a deficient number, since it is larger than the sum of its proper divisors (484968070).

646624084 is a wasteful number, since it uses less digits than its factorization.

646624084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161656025 (or 161656023 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The square root of 646624084 is about 25428.8042188381. The cubic root of 646624084 is about 864.7368346415.

The spelling of 646624084 in words is "six hundred forty-six million, six hundred twenty-four thousand, eighty-four".