23278013 has 4 divisors (see below), whose sum is σ = 25394208. Its totient is φ = 21161820.

The previous prime is 23277967. The next prime is 23278033. The reversal of 23278013 is 31087232.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23278013 - 2⁸ = 23277757 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 (23278033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1058081 + ... + 1058102.

It is an arithmetic number, because the mean of its divisors is an integer number (6348552).

Almost surely, 2^23278013 is an apocalyptic number.

It is an amenable number.

23278013 is a deficient number, since it is larger than the sum of its proper divisors (2116195).

23278013 is a wasteful number, since it uses less digits than its factorization.

23278013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116194.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 23278013 is about 4824.7293188323. The cubic root of 23278013 is about 285.5279554028.

The spelling of 23278013 in words is "twenty-three million, two hundred seventy-eight thousand, thirteen".