23728681 has 2 divisors, whose sum is σ = 23728682. Its totient is φ = 23728680.

The previous prime is 23728673. The next prime is 23728687. The reversal of 23728681 is 18682732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20976400 + 2752281 = 4580^2 + 1659^2 .

It is a cyclic number.

It is not a de Polignac number, because 23728681 - 2³ = 23728673 is a prime.

It is a super-2 number, since 2×23728681² = 1126100603999522, 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 23728681.

It is not a weakly prime, because it can be changed into another prime (23728687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11864340 + 11864341.

It is an arithmetic number, because the mean of its divisors is an integer number (11864341).

Almost surely, 2^23728681 is an apocalyptic number.

It is an amenable number.

23728681 is a deficient number, since it is larger than the sum of its proper divisors (1).

23728681 is an equidigital number, since it uses as much as digits as its factorization.

23728681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 23728681 is about 4871.2093980859. The cubic root of 23728681 is about 287.3588206651.

The spelling of 23728681 in words is "twenty-three million, seven hundred twenty-eight thousand, six hundred eighty-one".