28563520 has 28 divisors (see below), whose sum is σ = 68017644. Its totient is φ = 11425280.

The previous prime is 28563503. The next prime is 28563523. The reversal of 28563520 is 2536582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10653696 + 17909824 = 3264^2 + 4232^2 .

It is not an unprimeable number, because it can be changed into a prime (28563523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44311 + ... + 44950.

Almost surely, 2^28563520 is an apocalyptic number.

28563520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28563520 is an abundant number, since it is smaller than the sum of its proper divisors (39454124).

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

28563520 is an equidigital number, since it uses as much as digits as its factorization.

28563520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89278 (or 89268 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 28563520 is about 5344.4850079311. The cubic root of 28563520 is about 305.6824992219.

The spelling of 28563520 in words is "twenty-eight million, five hundred sixty-three thousand, five hundred twenty".