23887681 has 6 divisors (see below), whose sum is σ = 24552150. Its totient is φ = 23240736.

The previous prime is 23887651. The next prime is 23887687. The reversal of 23887681 is 18678832.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 20793600 + 3094081 = 4560^2 + 1759^2 .

It is not a de Polignac number, because 23887681 - 2¹³ = 23879489 is a prime.

It is a super-2 number, since 2×23887681² = 1141242607115522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23887687) 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, 7356 + ... + 10093.

It is an arithmetic number, because the mean of its divisors is an integer number (4092025).

Almost surely, 2^23887681 is an apocalyptic number.

It is an amenable number.

23887681 is a deficient number, since it is larger than the sum of its proper divisors (664469).

23887681 is an equidigital number, since it uses as much as digits as its factorization.

23887681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17523 (or 17486 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 23887681 is about 4887.5025319687. The cubic root of 23887681 is about 287.9992324118. Note that the first 3 decimals are identical.

The spelling of 23887681 in words is "twenty-three million, eight hundred eighty-seven thousand, six hundred eighty-one".