28821250 has 20 divisors (see below), whose sum is σ = 54024894. Its totient is φ = 11528000.

The previous prime is 28821229. The next prime is 28821301. The reversal of 28821250 is 5212882.

It can be written as a sum of positive squares in 5 ways, for example, as 4289041 + 24532209 = 2071^2 + 4953^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10279 + ... + 12778.

Almost surely, 2^28821250 is an apocalyptic number.

28821250 is a deficient number, since it is larger than the sum of its proper divisors (25203644).

28821250 is an equidigital number, since it uses as much as digits as its factorization.

28821250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23079 (or 23064 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 28821250 is about 5368.5426327822. The cubic root of 28821250 is about 306.5991436612.

The spelling of 28821250 in words is "twenty-eight million, eight hundred twenty-one thousand, two hundred fifty".