23640870 has 64 divisors (see below), whose sum is σ = 62830080. Its totient is φ = 5644800.

The previous prime is 23640847. The next prime is 23640871. The reversal of 23640870 is 7804632.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23640871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22926 + ... + 23934.

It is an arithmetic number, because the mean of its divisors is an integer number (981720).

Almost surely, 2^23640870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23640870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31415040).

23640870 is an abundant number, since it is smaller than the sum of its proper divisors (39189210).

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

23640870 is a wasteful number, since it uses less digits than its factorization.

23640870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 23640870 is about 4862.1877791792. The cubic root of 23640870 is about 287.0039132312.

The spelling of 23640870 in words is "twenty-three million, six hundred forty thousand, eight hundred seventy".