23628991 has 2 divisors, whose sum is σ = 23628992. Its totient is φ = 23628990.

The previous prime is 23628967. The next prime is 23629019. The reversal of 23628991 is 19982632.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23628991 - 2⁵ = 23628959 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23628901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11814495 + 11814496.

It is an arithmetic number, because the mean of its divisors is an integer number (11814496).

Almost surely, 2^23628991 is an apocalyptic number.

23628991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23628991 is an equidigital number, since it uses as much as digits as its factorization.

23628991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 23628991 is about 4860.9660562485. The cubic root of 23628991 is about 286.9558341957.

The spelling of 23628991 in words is "twenty-three million, six hundred twenty-eight thousand, nine hundred ninety-one".