28090860 has 48 divisors (see below), whose sum is σ = 89892096. Its totient is φ = 6420672.

The previous prime is 28090859. The next prime is 28090877. The reversal of 28090860 is 6809082.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33022 + ... + 33861.

It is an arithmetic number, because the mean of its divisors is an integer number (1872752).

Almost surely, 2^28090860 is an apocalyptic number.

28090860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28090860 is an abundant number, since it is smaller than the sum of its proper divisors (61801236).

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

28090860 is a wasteful number, since it uses less digits than its factorization.

28090860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66902 (or 66900 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 28090860 is about 5300.0811314545. The cubic root of 28090860 is about 303.9870002520.

The spelling of 28090860 in words is "twenty-eight million, ninety thousand, eight hundred sixty".