28805560 has 32 divisors (see below), whose sum is σ = 74072160. Its totient is φ = 9876096.

The previous prime is 28805527. The next prime is 28805561. The reversal of 28805560 is 6550882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28805561) 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, 51159 + ... + 51718.

It is an arithmetic number, because the mean of its divisors is an integer number (2314755).

Almost surely, 2^28805560 is an apocalyptic number.

28805560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28805560 is an abundant number, since it is smaller than the sum of its proper divisors (45266600).

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

28805560 is a wasteful number, since it uses less digits than its factorization.

28805560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102895 (or 102891 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 28805560 is about 5367.0811434149. The cubic root of 28805560 is about 306.5434970606.

The spelling of 28805560 in words is "twenty-eight million, eight hundred five thousand, five hundred sixty".