28565520 has 80 divisors (see below), whose sum is σ = 90744192. Its totient is φ = 7429120.

The previous prime is 28565513. The next prime is 28565533. The reversal of 28565520 is 2556582.

It is a tau number, because it is divible by the number of its divisors (80).

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, 8389 + ... + 11291.

Almost surely, 2^28565520 is an apocalyptic number.

28565520 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 28565520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45372096).

28565520 is an abundant number, since it is smaller than the sum of its proper divisors (62178672).

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

28565520 is a wasteful number, since it uses less digits than its factorization.

28565520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960 (or 2954 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 28565520 is about 5344.6721134229. The cubic root of 28565520 is about 305.6896336218.

The spelling of 28565520 in words is "twenty-eight million, five hundred sixty-five thousand, five hundred twenty".