23647681 has 2 divisors, whose sum is σ = 23647682. Its totient is φ = 23647680.

The previous prime is 23647661. The next prime is 23647691. The reversal of 23647681 is 18674632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17297281 + 6350400 = 4159^2 + 2520^2 .

It is a cyclic number.

It is not a de Polignac number, because 23647681 - 2⁵ = 23647649 is a prime.

It is a super-2 number, since 2×23647681² = 1118425633355522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23647681.

It is not a weakly prime, because it can be changed into another prime (23647601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11823840 + 11823841.

It is an arithmetic number, because the mean of its divisors is an integer number (11823841).

Almost surely, 2^23647681 is an apocalyptic number.

It is an amenable number.

23647681 is a deficient number, since it is larger than the sum of its proper divisors (1).

23647681 is an equidigital number, since it uses as much as digits as its factorization.

23647681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 23647681 is about 4862.8881336095. Note that the first 3 decimals coincide. The cubic root of 23647681 is about 287.0314727916.

The spelling of 23647681 in words is "twenty-three million, six hundred forty-seven thousand, six hundred eighty-one".