646288856 has 32 divisors (see below), whose sum is σ = 1233565200. Its totient is φ = 317376000.

The previous prime is 646288849. The next prime is 646288859. The reversal of 646288856 is 658882646.

It is a junction number, because it is equal to n+sod(n) for n = 646288798 and 646288807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646288859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144380 + ... + 148788.

Almost surely, 2^646288856 is an apocalyptic number.

It is an amenable number.

646288856 is a deficient number, since it is larger than the sum of its proper divisors (587276344).

646288856 is a wasteful number, since it uses less digits than its factorization.

646288856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4739 (or 4735 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 53.

The square root of 646288856 is about 25422.2118628573. The cubic root of 646288856 is about 864.5873742281.

The spelling of 646288856 in words is "six hundred forty-six million, two hundred eighty-eight thousand, eight hundred fifty-six".