128726523 has 8 divisors (see below), whose sum is σ = 190706000. Its totient is φ = 85817664.

The previous prime is 128726519. The next prime is 128726557. The reversal of 128726523 is 325627821.

128726523 is a `hidden beast` number, since 128 + 7 + 2 + 6 + 523 = 666.

It is not a de Polignac number, because 128726523 - 2² = 128726519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128726503) 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, 2383798 + ... + 2383851.

It is an arithmetic number, because the mean of its divisors is an integer number (23838250).

Almost surely, 2^128726523 is an apocalyptic number.

128726523 is a deficient number, since it is larger than the sum of its proper divisors (61979477).

128726523 is an equidigital number, since it uses as much as digits as its factorization.

128726523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4767658 (or 4767652 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 128726523 is about 11345.7711505212. The cubic root of 128726523 is about 504.9201233008.

The spelling of 128726523 in words is "one hundred twenty-eight million, seven hundred twenty-six thousand, five hundred twenty-three".