28245128 has 12 divisors (see below), whose sum is σ = 52987815. Its totient is φ = 14115048.

The previous prime is 28245079. The next prime is 28245157. The reversal of 28245128 is 82154282.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 14122564 + 14122564 = 3758^2 + 3758^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3758.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28245094 and 28245103.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14093 + ... + 15971.

Almost surely, 2^28245128 is an apocalyptic number.

It is an amenable number.

28245128 is a deficient number, since it is larger than the sum of its proper divisors (24742687).

28245128 is an frugal number, since it uses more digits than its factorization.

28245128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3764 (or 1881 counting only the distinct ones).

The product of its digits is 10240, while the sum is 32.

The square root of 28245128 is about 5314.6145673981. The cubic root of 28245128 is about 304.5424582841.

Multiplying 28245128 by its sum of digits (32), we get a square (903844096 = 30064²).

The spelling of 28245128 in words is "twenty-eight million, two hundred forty-five thousand, one hundred twenty-eight".