28248750 has 140 divisors (see below), whose sum is σ = 81948768. Its totient is φ = 7290000.

The previous prime is 28248743. The next prime is 28248751. The reversal of 28248750 is 5784282.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28248751) by changing a digit.

It is a polite number, since it can be written in 69 ways as a sum of consecutive naturals, for example, 911235 + ... + 911265.

Almost surely, 2^28248750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28248750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40974384).

28248750 is an abundant number, since it is smaller than the sum of its proper divisors (53700018).

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

28248750 is an frugal number, since it uses more digits than its factorization.

28248750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28248750 is about 5314.9553149580. The cubic root of 28248750 is about 304.5554753448. Note that the first 3 decimals are identical.

The spelling of 28248750 in words is "twenty-eight million, two hundred forty-eight thousand, seven hundred fifty".