28108560 has 40 divisors (see below), whose sum is σ = 87137280. Its totient is φ = 7495552.

The previous prime is 28108559. The next prime is 28108573. The reversal of 28108560 is 6580182.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×28108560² = 1580182290547200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58320 + ... + 58799.

It is an arithmetic number, because the mean of its divisors is an integer number (2178432).

Almost surely, 2^28108560 is an apocalyptic number.

28108560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28108560 is an abundant number, since it is smaller than the sum of its proper divisors (59028720).

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

28108560 is a wasteful number, since it uses less digits than its factorization.

28108560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117135 (or 117129 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 28108560 is about 5301.7506542651. The cubic root of 28108560 is about 304.0508340661.

The spelling of 28108560 in words is "twenty-eight million, one hundred eight thousand, five hundred sixty".