23672581 has 4 divisors (see below), whose sum is σ = 23694892. Its totient is φ = 23650272.

The previous prime is 23672569. The next prime is 23672599. The reversal of 23672581 is 18527632.

It is a happy number.

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 919681 + 22752900 = 959^2 + 4770^2 .

It is a cyclic number.

It is not a de Polignac number, because 23672581 - 2¹⁵ = 23639813 is a prime.

It is a super-2 number, since 2×23672581² = 1120782182403122, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23672501) 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, 9480 + ... + 11713.

It is an arithmetic number, because the mean of its divisors is an integer number (5923723).

Almost surely, 2^23672581 is an apocalyptic number.

It is an amenable number.

23672581 is a deficient number, since it is larger than the sum of its proper divisors (22311).

23672581 is a wasteful number, since it uses less digits than its factorization.

23672581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22310.

The product of its digits is 20160, while the sum is 34.

The square root of 23672581 is about 4865.4476669676. The cubic root of 23672581 is about 287.1321814208.

The spelling of 23672581 in words is "twenty-three million, six hundred seventy-two thousand, five hundred eighty-one".