23440637640 has 96 divisors (see below), whose sum is σ = 81803062080. Its totient is φ = 5357858688.

The previous prime is 23440637617. The next prime is 23440637719. The reversal of 23440637640 is 4673604432.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1987372 + ... + 1999131.

It is an arithmetic number, because the mean of its divisors is an integer number (852115230).

Almost surely, 2^23440637640 is an apocalyptic number.

23440637640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23440637640 is an abundant number, since it is smaller than the sum of its proper divisors (58362424440).

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

23440637640 is a wasteful number, since it uses less digits than its factorization.

23440637640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986531 (or 3986520 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 39.

The spelling of 23440637640 in words is "twenty-three billion, four hundred forty million, six hundred thirty-seven thousand, six hundred forty".