28805920 has 96 divisors (see below), whose sum is σ = 80015040. Its totient is φ = 9661440.

The previous prime is 28805893. The next prime is 28805929. The reversal of 28805920 is 2950882.

It is not an unprimeable number, because it can be changed into a prime (28805929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22251 + ... + 23509.

It is an arithmetic number, because the mean of its divisors is an integer number (833490).

Almost surely, 2^28805920 is an apocalyptic number.

28805920 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 28805920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40007520).

28805920 is an abundant number, since it is smaller than the sum of its proper divisors (51209120).

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

28805920 is a wasteful number, since it uses less digits than its factorization.

28805920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 28805920 is about 5367.1146810926. The cubic root of 28805920 is about 306.5447740733.

The spelling of 28805920 in words is "twenty-eight million, eight hundred five thousand, nine hundred twenty".