28881784220 has 24 divisors (see below), whose sum is σ = 60736132800. Its totient is φ = 11536640192.

The previous prime is 28881784163. The next prime is 28881784247. The reversal of 28881784220 is 2248718882.

It is a congruent number.

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, 989855 + ... + 1018614.

It is an arithmetic number, because the mean of its divisors is an integer number (2530672200).

Almost surely, 2^28881784220 is an apocalyptic number.

28881784220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28881784220 is an abundant number, since it is smaller than the sum of its proper divisors (31854348580).

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

28881784220 is a wasteful number, since it uses less digits than its factorization.

28881784220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009197 (or 2009195 counting only the distinct ones).

The product of its (nonzero) digits is 917504, while the sum is 50.

The spelling of 28881784220 in words is "twenty-eight billion, eight hundred eighty-one million, seven hundred eighty-four thousand, two hundred twenty".