23648991 has 16 divisors (see below), whose sum is σ = 33281280. Its totient is φ = 14907200.

The previous prime is 23648987. The next prime is 23649019. The reversal of 23648991 is 19984632.

It is a cyclic number.

It is not a de Polignac number, because 23648991 - 2² = 23648987 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23648951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4216 + ... + 8066.

It is an arithmetic number, because the mean of its divisors is an integer number (2080080).

Almost surely, 2^23648991 is an apocalyptic number.

23648991 is a deficient number, since it is larger than the sum of its proper divisors (9632289).

23648991 is a wasteful number, since it uses less digits than its factorization.

23648991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966.

The product of its digits is 93312, while the sum is 42.

The square root of 23648991 is about 4863.0228253628. The cubic root of 23648991 is about 287.0367728784.

The spelling of 23648991 in words is "twenty-three million, six hundred forty-eight thousand, nine hundred ninety-one".