646485880 has 32 divisors (see below), whose sum is σ = 1466058240. Its totient is φ = 256556160.

The previous prime is 646485871. The next prime is 646485899. The reversal of 646485880 is 88584646.

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, 58551 + ... + 68710.

It is an arithmetic number, because the mean of its divisors is an integer number (45814320).

Almost surely, 2^646485880 is an apocalyptic number.

It is an amenable number.

646485880 is an abundant number, since it is smaller than the sum of its proper divisors (819572360).

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

646485880 is a wasteful number, since it uses less digits than its factorization.

646485880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127399 (or 127395 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 49.

The square root of 646485880 is about 25426.0866041159. The cubic root of 646485880 is about 864.6752230561.

The spelling of 646485880 in words is "six hundred forty-six million, four hundred eighty-five thousand, eight hundred eighty".