28809560 has 64 divisors (see below), whose sum is σ = 73936800. Its totient is φ = 10008576.

The previous prime is 28809559. The next prime is 28809587. The reversal of 28809560 is 6590882.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7211 + ... + 10469.

Almost surely, 2^28809560 is an apocalyptic number.

28809560 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 28809560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36968400).

28809560 is an abundant number, since it is smaller than the sum of its proper divisors (45127240).

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

28809560 is a wasteful number, since it uses less digits than its factorization.

28809560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300 (or 3296 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 28809560 is about 5367.4537725070. The cubic root of 28809560 is about 306.5576854932.

The spelling of 28809560 in words is "twenty-eight million, eight hundred nine thousand, five hundred sixty".