23128965 has 12 divisors (see below), whose sum is σ = 40090284. Its totient is φ = 12335424.

The previous prime is 23128951. The next prime is 23128981. The reversal of 23128965 is 56982132.

It can be written as a sum of positive squares in 2 ways, for example, as 7518564 + 15610401 = 2742^2 + 3951^2 .

It is not a de Polignac number, because 23128965 - 2⁶ = 23128901 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 256944 + ... + 257033.

It is an arithmetic number, because the mean of its divisors is an integer number (3340857).

Almost surely, 2^23128965 is an apocalyptic number.

It is an amenable number.

23128965 is a deficient number, since it is larger than the sum of its proper divisors (16961319).

23128965 is a wasteful number, since it uses less digits than its factorization.

23128965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513988 (or 513985 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 23128965 is about 4809.2582588170. The cubic root of 23128965 is about 284.9172428230.

The spelling of 23128965 in words is "twenty-three million, one hundred twenty-eight thousand, nine hundred sixty-five".