28289250 has 160 divisors (see below), whose sum is σ = 86980608. Its totient is φ = 6804000.

The previous prime is 28289249. The next prime is 28289251. The reversal of 28289250 is 5298282.

It is an interprime number because it is at equal distance from previous prime (28289249) and next prime (28289251).

It is not an unprimeable number, because it can be changed into a prime (28289251) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 222687 + ... + 222813.

Almost surely, 2^28289250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28289250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43490304).

28289250 is an abundant number, since it is smaller than the sum of its proper divisors (58691358).

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

28289250 is a wasteful number, since it uses less digits than its factorization.

28289250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28289250 is about 5318.7639541533. The cubic root of 28289250 is about 304.7009520688.

The spelling of 28289250 in words is "twenty-eight million, two hundred eighty-nine thousand, two hundred fifty".