28090980 has 36 divisors (see below), whose sum is σ = 85209852. Its totient is φ = 7490880.

The previous prime is 28090973. The next prime is 28090999. The reversal of 28090980 is 8909082.

It can be written as a sum of positive squares in 2 ways, for example, as 22127616 + 5963364 = 4704^2 + 2442^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 77851 + ... + 78210.

Almost surely, 2^28090980 is an apocalyptic number.

28090980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28090980 is an abundant number, since it is smaller than the sum of its proper divisors (57118872).

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

28090980 is a wasteful number, since it uses less digits than its factorization.

28090980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156076 (or 156071 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 28090980 is about 5300.0924520238. The cubic root of 28090980 is about 303.9874331139.

The spelling of 28090980 in words is "twenty-eight million, ninety thousand, nine hundred eighty".