28380902256 has 320 divisors, whose sum is σ = 100290723840. Its totient is φ = 7505498880.

The previous prime is 28380902203. The next prime is 28380902293. The reversal of 28380902256 is 65220908382.

It is a happy number.

It is a super-2 number, since 2×28380902256² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2149531 + ... + 2162693.

It is an arithmetic number, because the mean of its divisors is an integer number (313408512).

Almost surely, 2^28380902256 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 28380902256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50145361920).

28380902256 is an abundant number, since it is smaller than the sum of its proper divisors (71909821584).

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

28380902256 is a wasteful number, since it uses less digits than its factorization.

28380902256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13241 (or 13229 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 28380902256 in words is "twenty-eight billion, three hundred eighty million, nine hundred two thousand, two hundred fifty-six".