23661745 has 12 divisors (see below), whose sum is σ = 29969460. Its totient is φ = 17931744.

The previous prime is 23661731. The next prime is 23661749. The reversal of 23661745 is 54716632.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8785296 + 14876449 = 2964^2 + 3857^2 .

It is not a de Polignac number, because 23661745 - 2⁵ = 23661713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23661745.

It is not an unprimeable number, because it can be changed into a prime (23661749) 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 11 ways as a sum of consecutive naturals, for example, 4750 + ... + 8359.

It is an arithmetic number, because the mean of its divisors is an integer number (2497455).

Almost surely, 2^23661745 is an apocalyptic number.

It is an amenable number.

23661745 is a deficient number, since it is larger than the sum of its proper divisors (6307715).

23661745 is a wasteful number, since it uses less digits than its factorization.

23661745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13152 (or 13133 counting only the distinct ones).

The product of its digits is 30240, while the sum is 34.

The square root of 23661745 is about 4864.3339729093. Note that the first 3 decimals coincide. The cubic root of 23661745 is about 287.0883636502.

The spelling of 23661745 in words is "twenty-three million, six hundred sixty-one thousand, seven hundred forty-five".