23640736 has 36 divisors (see below), whose sum is σ = 54145098. Its totient is φ = 10131072.

The previous prime is 23640691. The next prime is 23640737. The reversal of 23640736 is 63704632.

It can be written as a sum of positive squares in only one way, i.e., 23464336 + 176400 = 4844^2 + 420^2 .

It is a junction number, because it is equal to n+sod(n) for n = 23640698 and 23640707.

It is not an unprimeable number, because it can be changed into a prime (23640737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5971 + ... + 9106.

Almost surely, 2^23640736 is an apocalyptic number.

It is an amenable number.

23640736 is an abundant number, since it is smaller than the sum of its proper divisors (30504362).

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

23640736 is a wasteful number, since it uses less digits than its factorization.

23640736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15101 (or 15086 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 31.

The square root of 23640736 is about 4862.1739993546. The cubic root of 23640736 is about 287.0033709697.

The spelling of 23640736 in words is "twenty-three million, six hundred forty thousand, seven hundred thirty-six".