647922656 has 24 divisors (see below), whose sum is σ = 1276362360. Its totient is φ = 323767168.

The previous prime is 647922643. The next prime is 647922733. The reversal of 647922656 is 656229746.

It is a self number, because there is not a number n which added to its sum of digits gives 647922656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58835 + ... + 68973.

It is an arithmetic number, because the mean of its divisors is an integer number (53181765).

Almost surely, 2^647922656 is an apocalyptic number.

It is an amenable number.

647922656 is a deficient number, since it is larger than the sum of its proper divisors (628439704).

647922656 is a wasteful number, since it uses less digits than its factorization.

647922656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12146 (or 12138 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 47.

The square root of 647922656 is about 25454.3248977458. The cubic root of 647922656 is about 865.3153120026.

The spelling of 647922656 in words is "six hundred forty-seven million, nine hundred twenty-two thousand, six hundred fifty-six".