28839520 has 24 divisors (see below), whose sum is σ = 68133744. Its totient is φ = 11535744.

The previous prime is 28839509. The next prime is 28839533. The reversal of 28839520 is 2593882.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28839520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89964 + ... + 90283.

It is an arithmetic number, because the mean of its divisors is an integer number (2838906).

Almost surely, 2^28839520 is an apocalyptic number.

28839520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28839520 is an abundant number, since it is smaller than the sum of its proper divisors (39294224).

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

28839520 is a wasteful number, since it uses less digits than its factorization.

28839520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180262 (or 180254 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 28839520 is about 5370.2439423177. The cubic root of 28839520 is about 306.6639151192.

It can be divided in two parts, 2883 and 9520, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 28839520 in words is "twenty-eight million, eight hundred thirty-nine thousand, five hundred twenty".