23028309 has 6 divisors (see below), whose sum is σ = 33263126. Its totient is φ = 15352200.

The previous prime is 23028307. The next prime is 23028311. The reversal of 23028309 is 90382032.

It is an interprime number because it is at equal distance from previous prime (23028307) and next prime (23028311).

It can be written as a sum of positive squares in only one way, i.e., 22297284 + 731025 = 4722^2 + 855^2 .

It is not a de Polignac number, because 23028309 - 2¹ = 23028307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23028301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1279342 + ... + 1279359.

Almost surely, 2^23028309 is an apocalyptic number.

It is an amenable number.

23028309 is a deficient number, since it is larger than the sum of its proper divisors (10234817).

23028309 is a wasteful number, since it uses less digits than its factorization.

23028309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558707 (or 2558704 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 23028309 is about 4798.7820329746. The cubic root of 23028309 is about 284.5033270038.

The spelling of 23028309 in words is "twenty-three million, twenty-eight thousand, three hundred nine".