23665616 has 20 divisors (see below), whose sum is σ = 49379652. Its totient is φ = 10922496.

The previous prime is 23665601. The next prime is 23665619. The reversal of 23665616 is 61656632.

It can be written as a sum of positive squares in 2 ways, for example, as 1008016 + 22657600 = 1004^2 + 4760^2 .

It is a super-2 number, since 2×23665616² = 1120122761318912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23665619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56681 + ... + 57096.

Almost surely, 2^23665616 is an apocalyptic number.

23665616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

23665616 is an abundant number, since it is smaller than the sum of its proper divisors (25714036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23665616 is a wasteful number, since it uses less digits than its factorization.

23665616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113798 (or 113792 counting only the distinct ones).

The product of its digits is 38880, while the sum is 35.

The square root of 23665616 is about 4864.7318528363. The cubic root of 23665616 is about 287.1040184333.

The spelling of 23665616 in words is "twenty-three million, six hundred sixty-five thousand, six hundred sixteen".