647665676 has 24 divisors (see below), whose sum is σ = 1302577920. Its totient is φ = 276018192.

The previous prime is 647665633. The next prime is 647665693. The reversal of 647665676 is 676566746.

It is a happy 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, 59600 + ... + 69623.

It is an arithmetic number, because the mean of its divisors is an integer number (54274080).

Almost surely, 2^647665676 is an apocalyptic number.

It is an amenable number.

647665676 is an abundant number, since it is smaller than the sum of its proper divisors (654912244).

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

647665676 is a wasteful number, since it uses less digits than its factorization.

647665676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129413 (or 129411 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 53.

The square root of 647665676 is about 25449.2765319567. The cubic root of 647665676 is about 865.2008960138.

The spelling of 647665676 in words is "six hundred forty-seven million, six hundred sixty-five thousand, six hundred seventy-six".