28452520 has 32 divisors (see below), whose sum is σ = 65230920. Its totient is φ = 11165440.

The previous prime is 28452517. The next prime is 28452521. The reversal of 28452520 is 2525482.

It can be written as a sum of positive squares in 4 ways, for example, as 28281124 + 171396 = 5318^2 + 414^2 .

It is not an unprimeable number, because it can be changed into a prime (28452521) 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 7 ways as a sum of consecutive naturals, for example, 4591 + ... + 8830.

Almost surely, 2^28452520 is an apocalyptic number.

28452520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28452520 is an abundant number, since it is smaller than the sum of its proper divisors (36778400).

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

28452520 is a wasteful number, since it uses less digits than its factorization.

28452520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13485 (or 13481 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 28452520 is about 5334.0903629391. The cubic root of 28452520 is about 305.2860167500.

The spelling of 28452520 in words is "twenty-eight million, four hundred fifty-two thousand, five hundred twenty".