28398558256 has 40 divisors (see below), whose sum is σ = 55189282640. Its totient is φ = 14156239104.

The previous prime is 28398558239. The next prime is 28398558271. The reversal of 28398558256 is 65285589382.

It is a super-2 number, since 2×28398558256² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28398558194 and 28398558203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8585755 + ... + 8589061.

It is an arithmetic number, because the mean of its divisors is an integer number (1379732066).

Almost surely, 2^28398558256 is an apocalyptic number.

It is an amenable number.

28398558256 is a deficient number, since it is larger than the sum of its proper divisors (26790724384).

28398558256 is a wasteful number, since it uses less digits than its factorization.

28398558256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4781 (or 4775 counting only the distinct ones).

The product of its digits is 41472000, while the sum is 61.

The spelling of 28398558256 in words is "twenty-eight billion, three hundred ninety-eight million, five hundred fifty-eight thousand, two hundred fifty-six".