28808520 has 128 divisors (see below), whose sum is σ = 94953600. Its totient is φ = 6948864.

The previous prime is 28808519. The next prime is 28808537. The reversal of 28808520 is 2580882.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91884 + ... + 92196.

It is an arithmetic number, because the mean of its divisors is an integer number (741825).

Almost surely, 2^28808520 is an apocalyptic number.

28808520 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 28808520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47476800).

28808520 is an abundant number, since it is smaller than the sum of its proper divisors (66145080).

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

28808520 is a wasteful number, since it uses less digits than its factorization.

28808520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 33.

The square root of 28808520 is about 5367.3568914318. The cubic root of 28808520 is about 306.5539966271.

The spelling of 28808520 in words is "twenty-eight million, eight hundred eight thousand, five hundred twenty".