28256622660 has 192 divisors, whose sum is σ = 100544371200. Its totient is φ = 6453748224.

The previous prime is 28256622649. The next prime is 28256622707. The reversal of 28256622660 is 6622665282.

28256622660 is a `hidden beast` number, since 2 + 8 + 2 + 566 + 2 + 26 + 60 = 666.

It is a super-3 number, since 3×28256622660³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7819014 + ... + 7822626.

It is an arithmetic number, because the mean of its divisors is an integer number (523668600).

Almost surely, 2^28256622660 is an apocalyptic number.

28256622660 is a gapful number since it is divisible by the number (20) 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 28256622660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50272185600).

28256622660 is an abundant number, since it is smaller than the sum of its proper divisors (72287748540).

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

28256622660 is a wasteful number, since it uses less digits than its factorization.

28256622660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5707 (or 5699 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 28256622660 in words is "twenty-eight billion, two hundred fifty-six million, six hundred twenty-two thousand, six hundred sixty".