647665674 has 16 divisors (see below), whose sum is σ = 1295738208. Its totient is φ = 215820752.

The previous prime is 647665633. The next prime is 647665693. The reversal of 647665674 is 476566746.

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, 6169 + ... + 36515.

It is an arithmetic number, because the mean of its divisors is an integer number (80983638).

Almost surely, 2^647665674 is an apocalyptic number.

647665674 is an abundant number, since it is smaller than the sum of its proper divisors (648072534).

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

647665674 is a wasteful number, since it uses less digits than its factorization.

647665674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33909.

The product of its digits is 5080320, while the sum is 51.

The square root of 647665674 is about 25449.2764926628. The cubic root of 647665674 is about 865.2008951232.

The spelling of 647665674 in words is "six hundred forty-seven million, six hundred sixty-five thousand, six hundred seventy-four".