28115250 has 64 divisors (see below), whose sum is σ = 73906560. Its totient is φ = 7099200.

The previous prime is 28115237. The next prime is 28115261. The reversal of 28115250 is 5251182.

It is a self number, because there is not a number n which added to its sum of digits gives 28115250.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13264 + ... + 15236.

It is an arithmetic number, because the mean of its divisors is an integer number (1154790).

Almost surely, 2^28115250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28115250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36953280).

28115250 is an abundant number, since it is smaller than the sum of its proper divisors (45791310).

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

28115250 is a wasteful number, since it uses less digits than its factorization.

28115250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012 (or 2002 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 28115250 is about 5302.3815404024. The cubic root of 28115250 is about 304.0749541055.

The spelling of 28115250 in words is "twenty-eight million, one hundred fifteen thousand, two hundred fifty".