647756872 has 32 divisors (see below), whose sum is σ = 1416384000. Its totient is φ = 277608912.

The previous prime is 647756839. The next prime is 647756881. The reversal of 647756872 is 278657746.

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, 115288 + ... + 120775.

It is an arithmetic number, because the mean of its divisors is an integer number (44262000).

Almost surely, 2^647756872 is an apocalyptic number.

It is an amenable number.

647756872 is an abundant number, since it is smaller than the sum of its proper divisors (768627128).

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

647756872 is a wasteful number, since it uses less digits than its factorization.

647756872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236090 (or 236072 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 52.

The square root of 647756872 is about 25451.0681897637. The cubic root of 647756872 is about 865.2415029508.

The spelling of 647756872 in words is "six hundred forty-seven million, seven hundred fifty-six thousand, eight hundred seventy-two".