28211250 has 40 divisors (see below), whose sum is σ = 70514928. Its totient is φ = 7522000.

The previous prime is 28211237. The next prime is 28211291. The reversal of 28211250 is 5211282.

It is a happy 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 19 ways as a sum of consecutive naturals, for example, 12 + ... + 7511.

Almost surely, 2^28211250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28211250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35257464).

28211250 is an abundant number, since it is smaller than the sum of its proper divisors (42303678).

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

28211250 is an equidigital number, since it uses as much as digits as its factorization.

28211250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7548 (or 7533 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 28211250 is about 5311.4263620990. The cubic root of 28211250 is about 304.4206506447.

The spelling of 28211250 in words is "twenty-eight million, two hundred eleven thousand, two hundred fifty".