28128235 has 8 divisors (see below), whose sum is σ = 34539120. Its totient is φ = 21979104.

The previous prime is 28128229. The next prime is 28128271. The reversal of 28128235 is 53282182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28128235 - 2⁵ = 28128203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28128197 and 28128206.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65200 + ... + 65629.

It is an arithmetic number, because the mean of its divisors is an integer number (4317390).

Almost surely, 2^28128235 is an apocalyptic number.

28128235 is a deficient number, since it is larger than the sum of its proper divisors (6410885).

28128235 is a wasteful number, since it uses less digits than its factorization.

28128235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130877.

The product of its digits is 7680, while the sum is 31.

The square root of 28128235 is about 5303.6058488542. The cubic root of 28128235 is about 304.1217591381.

The spelling of 28128235 in words is "twenty-eight million, one hundred twenty-eight thousand, two hundred thirty-five".