27728617656 has 64 divisors (see below), whose sum is σ = 72380689920. Its totient is φ = 8835488640.

The previous prime is 27728617607. The next prime is 27728617711. The reversal of 27728617656 is 65671682772.

It is a super-2 number, since 2×27728617656² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27728617596 and 27728617605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 919701 + ... + 949371.

It is an arithmetic number, because the mean of its divisors is an integer number (1130948280).

Almost surely, 2^27728617656 is an apocalyptic number.

It is an amenable number.

27728617656 is an abundant number, since it is smaller than the sum of its proper divisors (44652072264).

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

27728617656 is a wasteful number, since it uses less digits than its factorization.

27728617656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31396 (or 31392 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 57.

The spelling of 27728617656 in words is "twenty-seven billion, seven hundred twenty-eight million, six hundred seventeen thousand, six hundred fifty-six".