28257528 has 96 divisors (see below), whose sum is σ = 79626960. Its totient is φ = 8302080.

The previous prime is 28257527. The next prime is 28257557. The reversal of 28257528 is 82575282.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28257521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 601201 + ... + 601247.

Almost surely, 2^28257528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28257528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39813480).

28257528 is an abundant number, since it is smaller than the sum of its proper divisors (51369432).

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

28257528 is a wasteful number, since it uses less digits than its factorization.

28257528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 106 counting only the distinct ones).

The product of its digits is 89600, while the sum is 39.

The square root of 28257528 is about 5315.7810338651. The cubic root of 28257528 is about 304.5870178744.

The spelling of 28257528 in words is "twenty-eight million, two hundred fifty-seven thousand, five hundred twenty-eight".