28107880 has 32 divisors (see below), whose sum is σ = 64592640. Its totient is φ = 11003200.

The previous prime is 28107857. The next prime is 28107881. The reversal of 28107880 is 8870182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28107881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5596 + ... + 9355.

It is an arithmetic number, because the mean of its divisors is an integer number (2018520).

Almost surely, 2^28107880 is an apocalyptic number.

28107880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28107880 is an abundant number, since it is smaller than the sum of its proper divisors (36484760).

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

28107880 is a wasteful number, since it uses less digits than its factorization.

28107880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15009 (or 15005 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 28107880 is about 5301.6865241166. The cubic root of 28107880 is about 304.0483821887.

The spelling of 28107880 in words is "twenty-eight million, one hundred seven thousand, eight hundred eighty".