28365556656 has 80 divisors (see below), whose sum is σ = 76507246080. Its totient is φ = 9038937600.

The previous prime is 28365556621. The next prime is 28365556657. The reversal of 28365556656 is 65665556382.

It is a junction number, because it is equal to n+sod(n) for n = 28365556596 and 28365556605.

It is not an unprimeable number, because it can be changed into a prime (28365556657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2244756 + ... + 2257356.

It is an arithmetic number, because the mean of its divisors is an integer number (956340576).

Almost surely, 2^28365556656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28365556656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38253623040).

28365556656 is an abundant number, since it is smaller than the sum of its proper divisors (48141689424).

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

28365556656 is a wasteful number, since it uses less digits than its factorization.

28365556656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14674 (or 14668 counting only the distinct ones).

The product of its digits is 38880000, while the sum is 57.

The spelling of 28365556656 in words is "twenty-eight billion, three hundred sixty-five million, five hundred fifty-six thousand, six hundred fifty-six".