28657072656 has 45 divisors (see below), whose sum is σ = 80205687471. Its totient is φ = 9551680416.

The previous prime is 28657072643. The next prime is 28657072667. The reversal of 28657072656 is 65627075682.

The square root of 28657072656 is 169284.

It is a perfect power (a square), and thus also a powerful number.

28657072656 is a `hidden beast` number, since 2 + 8 + 6 + 570 + 7 + 2 + 65 + 6 = 666.

It is a super-2 number, since 2×28657072656² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2024355 + ... + 2038461.

Almost surely, 2^28657072656 is an apocalyptic number.

28657072656 is the 169284-th square number.

It is an amenable number.

28657072656 is an abundant number, since it is smaller than the sum of its proper divisors (51548614815).

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

28657072656 is an frugal number, since it uses more digits than its factorization.

28657072656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28228 (or 14112 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The spelling of 28657072656 in words is "twenty-eight billion, six hundred fifty-seven million, seventy-two thousand, six hundred fifty-six".