28624867656 has 128 divisors (see below), whose sum is σ = 89569013760. Its totient is φ = 7405977600.

The previous prime is 28624867643. The next prime is 28624867697. The reversal of 28624867656 is 65676842682.

It is a self number, because there is not a number n which added to its sum of digits gives 28624867656.

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, 444801 + ... + 505071.

It is an arithmetic number, because the mean of its divisors is an integer number (699757920).

Almost surely, 2^28624867656 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 28624867656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44784506880).

28624867656 is an abundant number, since it is smaller than the sum of its proper divisors (60944146104).

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

28624867656 is a wasteful number, since it uses less digits than its factorization.

28624867656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60555 (or 60551 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 60.

The spelling of 28624867656 in words is "twenty-eight billion, six hundred twenty-four million, eight hundred sixty-seven thousand, six hundred fifty-six".