23640786840 has 128 divisors (see below), whose sum is σ = 81921093120. Its totient is φ = 5393971200.

The previous prime is 23640786821. The next prime is 23640786847. The reversal of 23640786840 is 4868704632.

It is a self number, because there is not a number n which added to its sum of digits gives 23640786840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23640786847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 504316 + ... + 549195.

It is an arithmetic number, because the mean of its divisors is an integer number (640008540).

Almost surely, 2^23640786840 is an apocalyptic number.

23640786840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23640786840 is an abundant number, since it is smaller than the sum of its proper divisors (58280306280).

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

23640786840 is a wasteful number, since it uses less digits than its factorization.

23640786840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053553 (or 1053549 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 48.

The spelling of 23640786840 in words is "twenty-three billion, six hundred forty million, seven hundred eighty-six thousand, eight hundred forty".