646499680 has 48 divisors (see below), whose sum is σ = 1548306144. Its totient is φ = 255052800.

The previous prime is 646499677. The next prime is 646499701. The reversal of 646499680 is 86994646.

It is a congruent number.

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, 15996 + ... + 39355.

It is an arithmetic number, because the mean of its divisors is an integer number (32256378).

Almost surely, 2^646499680 is an apocalyptic number.

It is an amenable number.

646499680 is an abundant number, since it is smaller than the sum of its proper divisors (901806464).

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

646499680 is a wasteful number, since it uses less digits than its factorization.

646499680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55439 (or 55431 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 52.

The square root of 646499680 is about 25426.3579775004. The cubic root of 646499680 is about 864.6813755149.

The spelling of 646499680 in words is "six hundred forty-six million, four hundred ninety-nine thousand, six hundred eighty".