128726823 has 8 divisors (see below), whose sum is σ = 173335536. Its totient is φ = 84968000.

The previous prime is 128726797. The next prime is 128726833. The reversal of 128726823 is 328627821.

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

It is a cyclic number.

It is not a de Polignac number, because 128726823 - 2¹³ = 128718631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128726833) 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, 212118 + ... + 212723.

It is an arithmetic number, because the mean of its divisors is an integer number (21666942).

Almost surely, 2^128726823 is an apocalyptic number.

128726823 is a deficient number, since it is larger than the sum of its proper divisors (44608713).

128726823 is a wasteful number, since it uses less digits than its factorization.

128726823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424945.

The product of its digits is 64512, while the sum is 39.

The square root of 128726823 is about 11345.7843712984. The cubic root of 128726823 is about 504.9205155430.

The spelling of 128726823 in words is "one hundred twenty-eight million, seven hundred twenty-six thousand, eight hundred twenty-three".