28118860 has 144 divisors (see below), whose sum is σ = 80075520. Its totient is φ = 8035200.

The previous prime is 28118821. The next prime is 28118933. The reversal of 28118860 is 6881182.

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 47 ways as a sum of consecutive naturals, for example, 907045 + ... + 907075.

It is an arithmetic number, because the mean of its divisors is an integer number (556080).

Almost surely, 2^28118860 is an apocalyptic number.

28118860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28118860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40037760).

28118860 is an abundant number, since it is smaller than the sum of its proper divisors (51956660).

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

28118860 is a wasteful number, since it uses less digits than its factorization.

28118860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 28118860 is about 5302.7219425499. The cubic root of 28118860 is about 304.0879679635.

The spelling of 28118860 in words is "twenty-eight million, one hundred eighteen thousand, eight hundred sixty".