23993421640 has 32 divisors (see below), whose sum is σ = 54070810560. Its totient is φ = 9582148800.

The previous prime is 23993421629. The next prime is 23993421653. The reversal of 23993421640 is 4612439932.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450066 + ... + 500545.

It is an arithmetic number, because the mean of its divisors is an integer number (1689712830).

Almost surely, 2^23993421640 is an apocalyptic number.

23993421640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23993421640 is an abundant number, since it is smaller than the sum of its proper divisors (30077388920).

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

23993421640 is a wasteful number, since it uses less digits than its factorization.

23993421640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951253 (or 951249 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 43.

The spelling of 23993421640 in words is "twenty-three billion, nine hundred ninety-three million, four hundred twenty-one thousand, six hundred forty".