28008520 has 32 divisors (see below), whose sum is σ = 66727800. Its totient is φ = 10544128.

The previous prime is 28008517. The next prime is 28008551. The reversal of 28008520 is 2580082.

It can be written as a sum of positive squares in 4 ways, for example, as 16434916 + 11573604 = 4054^2 + 3402^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19915 + ... + 21274.

Almost surely, 2^28008520 is an apocalyptic number.

28008520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28008520 is an abundant number, since it is smaller than the sum of its proper divisors (38719280).

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

28008520 is a wasteful number, since it uses less digits than its factorization.

28008520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41217 (or 41213 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 28008520 is about 5292.3076252236. The cubic root of 28008520 is about 303.6896937523.

The spelling of 28008520 in words is "twenty-eight million, eight thousand, five hundred twenty".