28357128 has 96 divisors (see below), whose sum is σ = 82555200. Its totient is φ = 9108288.

The previous prime is 28357127. The next prime is 28357141. The reversal of 28357128 is 82175382.

28357128 is a `hidden beast` number, since 2 + 83 + 571 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28357092 and 28357101.

It is not an unprimeable number, because it can be changed into a prime (28357127) 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, 56125 + ... + 56627.

It is an arithmetic number, because the mean of its divisors is an integer number (859950).

Almost surely, 2^28357128 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 28357128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41277600).

28357128 is an abundant number, since it is smaller than the sum of its proper divisors (54198072).

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

28357128 is a wasteful number, since it uses less digits than its factorization.

28357128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 537 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28357128 is about 5325.1411248905. The cubic root of 28357128 is about 304.9444600114.

The spelling of 28357128 in words is "twenty-eight million, three hundred fifty-seven thousand, one hundred twenty-eight".