28562581220 has 12 divisors (see below), whose sum is σ = 59981420604. Its totient is φ = 11425032480.

The previous prime is 28562581213. The next prime is 28562581283. The reversal of 28562581220 is 2218526582.

It can be written as a sum of positive squares in 2 ways, for example, as 5992927396 + 22569653824 = 77414^2 + 150232^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 714064511 + ... + 714064550.

It is an arithmetic number, because the mean of its divisors is an integer number (4998451717).

Almost surely, 2^28562581220 is an apocalyptic number.

28562581220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28562581220 is an abundant number, since it is smaller than the sum of its proper divisors (31418839384).

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

28562581220 is a wasteful number, since it uses less digits than its factorization.

28562581220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428129070 (or 1428129068 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 41.

The spelling of 28562581220 in words is "twenty-eight billion, five hundred sixty-two million, five hundred eighty-one thousand, two hundred twenty".