23173938640 has 40 divisors (see below), whose sum is σ = 54528572448. Its totient is φ = 9157891200.

The previous prime is 23173938607. The next prime is 23173938691. The reversal of 23173938640 is 4683937132.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 1738386 + ... + 1751665.

Almost surely, 2^23173938640 is an apocalyptic number.

23173938640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23173938640 is an abundant number, since it is smaller than the sum of its proper divisors (31354633808).

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

23173938640 is a wasteful number, since it uses less digits than its factorization.

23173938640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3490147 (or 3490141 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 23173938640 in words is "twenty-three billion, one hundred seventy-three million, nine hundred thirty-eight thousand, six hundred forty".