28180860 has 96 divisors (see below), whose sum is σ = 82790400. Its totient is φ = 7153920.

The previous prime is 28180811. The next prime is 28180879. The reversal of 28180860 is 6808182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202671 + ... + 202809.

It is an arithmetic number, because the mean of its divisors is an integer number (862400).

Almost surely, 2^28180860 is an apocalyptic number.

28180860 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 28180860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41395200).

28180860 is an abundant number, since it is smaller than the sum of its proper divisors (54609540).

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

28180860 is a wasteful number, since it uses less digits than its factorization.

28180860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 28180860 is about 5308.5647777907. The cubic root of 28180860 is about 304.3113010353.

The spelling of 28180860 in words is "twenty-eight million, one hundred eighty thousand, eight hundred sixty".