23215867440 has 80 divisors (see below), whose sum is σ = 75757056000. Its totient is φ = 5865060096.

The previous prime is 23215867417. The next prime is 23215867447. The reversal of 23215867440 is 4476851232.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 23215867392 and 23215867401.

It is not an unprimeable number, because it can be changed into a prime (23215867447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2541040 + ... + 2550159.

It is an arithmetic number, because the mean of its divisors is an integer number (946963200).

Almost surely, 2^23215867440 is an apocalyptic number.

23215867440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23215867440 is an abundant number, since it is smaller than the sum of its proper divisors (52541188560).

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

23215867440 is a wasteful number, since it uses less digits than its factorization.

23215867440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5091234 (or 5091228 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 42.

The spelling of 23215867440 in words is "twenty-three billion, two hundred fifteen million, eight hundred sixty-seven thousand, four hundred forty".