128781724623 has 8 divisors (see below), whose sum is σ = 171827310336. Its totient is φ = 85795311000.

The previous prime is 128781724613. The next prime is 128781724649. The reversal of 128781724623 is 326427187821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128781724623 - 2¹⁰ = 128781723599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128781724613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14787943 + ... + 14796648.

It is an arithmetic number, because the mean of its divisors is an integer number (21478413792).

Almost surely, 2^128781724623 is an apocalyptic number.

128781724623 is a deficient number, since it is larger than the sum of its proper divisors (43045585713).

128781724623 is a wasteful number, since it uses less digits than its factorization.

128781724623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29586045.

The product of its digits is 1806336, while the sum is 51.

The spelling of 128781724623 in words is "one hundred twenty-eight billion, seven hundred eighty-one million, seven hundred twenty-four thousand, six hundred twenty-three".