28022664880 has 120 divisors (see below), whose sum is σ = 75921176448. Its totient is φ = 9591128064.

The previous prime is 28022664869. The next prime is 28022664899. The reversal of 28022664880 is 8846622082.

It is a self number, because there is not a number n which added to its sum of digits gives 28022664880.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2373552 + ... + 2385328.

Almost surely, 2^28022664880 is an apocalyptic number.

28022664880 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 28022664880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37960588224).

28022664880 is an abundant number, since it is smaller than the sum of its proper divisors (47898511568).

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

28022664880 is a wasteful number, since it uses less digits than its factorization.

28022664880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12411 (or 12398 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 46.

The spelling of 28022664880 in words is "twenty-eight billion, twenty-two million, six hundred sixty-four thousand, eight hundred eighty".