23128285 has 4 divisors (see below), whose sum is σ = 27753948. Its totient is φ = 18502624.

The previous prime is 23128253. The next prime is 23128307. The reversal of 23128285 is 58282132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5938969 + 17189316 = 2437^2 + 4146^2 .

It is a cyclic number.

It is not a de Polignac number, because 23128285 - 2⁵ = 23128253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2312824 + ... + 2312833.

It is an arithmetic number, because the mean of its divisors is an integer number (6938487).

Almost surely, 2^23128285 is an apocalyptic number.

It is an amenable number.

23128285 is a deficient number, since it is larger than the sum of its proper divisors (4625663).

23128285 is an equidigital number, since it uses as much as digits as its factorization.

23128285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4625662.

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

The square root of 23128285 is about 4809.1875613247. The cubic root of 23128285 is about 284.9144505720.

The spelling of 23128285 in words is "twenty-three million, one hundred twenty-eight thousand, two hundred eighty-five".