23428565 has 4 divisors (see below), whose sum is σ = 28114284. Its totient is φ = 18742848.

The previous prime is 23428553. The next prime is 23428571. The reversal of 23428565 is 56582432.

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 9597604 + 13830961 = 3098^2 + 3719^2 .

It is a cyclic number.

It is not a de Polignac number, because 23428565 - 2¹⁶ = 23363029 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 2342852 + ... + 2342861.

It is an arithmetic number, because the mean of its divisors is an integer number (7028571).

Almost surely, 2^23428565 is an apocalyptic number.

It is an amenable number.

23428565 is a deficient number, since it is larger than the sum of its proper divisors (4685719).

23428565 is an equidigital number, since it uses as much as digits as its factorization.

23428565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4685718.

The product of its digits is 57600, while the sum is 35.

The square root of 23428565 is about 4840.3062919613. The cubic root of 23428565 is about 286.1421897165.

The spelling of 23428565 in words is "twenty-three million, four hundred twenty-eight thousand, five hundred sixty-five".