28090664056 has 128 divisors (see below), whose sum is σ = 65407305600. Its totient is φ = 11013488640.

The previous prime is 28090664003. The next prime is 28090664093. The reversal of 28090664056 is 65046609082.

It is a super-2 number, since 2×28090664056² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28090663997 and 28090664015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72212310 + ... + 72212698.

It is an arithmetic number, because the mean of its divisors is an integer number (510994575).

Almost surely, 2^28090664056 is an apocalyptic number.

28090664056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28090664056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32703652800).

28090664056 is an abundant number, since it is smaller than the sum of its proper divisors (37316641544).

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

28090664056 is a wasteful number, since it uses less digits than its factorization.

28090664056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049 (or 1045 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 28090664056 in words is "twenty-eight billion, ninety million, six hundred sixty-four thousand, fifty-six".