28257750 has 96 divisors (see below), whose sum is σ = 80552160. Its totient is φ = 7128000.

The previous prime is 28257743. The next prime is 28257773. The reversal of 28257750 is 5775282.

28257750 is a `hidden beast` number, since 2 + 82 + 577 + 5 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42420 + ... + 43080.

It is an arithmetic number, because the mean of its divisors is an integer number (839085).

Almost surely, 2^28257750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28257750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40276080).

28257750 is an abundant number, since it is smaller than the sum of its proper divisors (52294410).

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

28257750 is a wasteful number, since it uses less digits than its factorization.

28257750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 28257750 is about 5315.8019150454. The cubic root of 28257750 is about 304.5878155161.

The spelling of 28257750 in words is "twenty-eight million, two hundred fifty-seven thousand, seven hundred fifty".