646315620 has 48 divisors (see below), whose sum is σ = 1821236928. Its totient is φ = 171250560.

The previous prime is 646315613. The next prime is 646315633. The reversal of 646315620 is 26513646.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24886 + ... + 43725.

It is an arithmetic number, because the mean of its divisors is an integer number (37942436).

Almost surely, 2^646315620 is an apocalyptic number.

646315620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646315620 is an abundant number, since it is smaller than the sum of its proper divisors (1174921308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646315620 is a wasteful number, since it uses less digits than its factorization.

646315620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68780 (or 68778 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 646315620 is about 25422.7382474823. The cubic root of 646315620 is about 864.5993087766.

The spelling of 646315620 in words is "six hundred forty-six million, three hundred fifteen thousand, six hundred twenty".