28525280 has 48 divisors (see below), whose sum is σ = 77021280. Its totient is φ = 9779712.

The previous prime is 28525253. The next prime is 28525283. The reversal of 28525280 is 8252582.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28525283) 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, 11615 + ... + 13854.

It is an arithmetic number, because the mean of its divisors is an integer number (1604610).

Almost surely, 2^28525280 is an apocalyptic number.

28525280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28525280 is an abundant number, since it is smaller than the sum of its proper divisors (48496000).

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

28525280 is a wasteful number, since it uses less digits than its factorization.

28525280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25491 (or 25483 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 28525280 is about 5340.9062901347. The cubic root of 28525280 is about 305.5460253899.

The spelling of 28525280 in words is "twenty-eight million, five hundred twenty-five thousand, two hundred eighty".