28387059220 has 24 divisors (see below), whose sum is σ = 64198426824. Its totient is φ = 10481375616.

The previous prime is 28387059167. The next prime is 28387059227. The reversal of 28387059220 is 2295078382.

It can be written as a sum of positive squares in 4 ways, for example, as 2034731664 + 26352327556 = 45108^2 + 162334^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28387059227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54590239 + ... + 54590758.

It is an arithmetic number, because the mean of its divisors is an integer number (2674934451).

Almost surely, 2^28387059220 is an apocalyptic number.

28387059220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28387059220 is an abundant number, since it is smaller than the sum of its proper divisors (35811367604).

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

28387059220 is a wasteful number, since it uses less digits than its factorization.

28387059220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109181019 (or 109181017 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 28387059220 in words is "twenty-eight billion, three hundred eighty-seven million, fifty-nine thousand, two hundred twenty".