28618256528 has 40 divisors (see below), whose sum is σ = 57519979200. Its totient is φ = 13777145984.

The previous prime is 28618256509. The next prime is 28618256533. The reversal of 28618256528 is 82565281682.

It is a super-2 number, since 2×28618256528² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28618256528.

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 7 ways as a sum of consecutive naturals, for example, 80675 + ... + 252477.

It is an arithmetic number, because the mean of its divisors is an integer number (1437999480).

Almost surely, 2^28618256528 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 28618256528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28759989600).

28618256528 is an abundant number, since it is smaller than the sum of its proper divisors (28901722672).

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

28618256528 is a wasteful number, since it uses less digits than its factorization.

28618256528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172199 (or 172193 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 53.

The spelling of 28618256528 in words is "twenty-eight billion, six hundred eighteen million, two hundred fifty-six thousand, five hundred twenty-eight".