28090081656 has 96 divisors (see below), whose sum is σ = 93633627360. Its totient is φ = 7408371456.

The previous prime is 28090081633. The next prime is 28090081667. The reversal of 28090081656 is 65618009082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2137075 + ... + 2150178.

It is an arithmetic number, because the mean of its divisors is an integer number (975350285).

Almost surely, 2^28090081656 is an apocalyptic number.

28090081656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28090081656 is an abundant number, since it is smaller than the sum of its proper divisors (65543545704).

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

28090081656 is a wasteful number, since it uses less digits than its factorization.

28090081656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4287285 (or 4287278 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 28090081656 in words is "twenty-eight billion, ninety million, eighty-one thousand, six hundred fifty-six".