128731726 has 8 divisors (see below), whose sum is σ = 203260680. Its totient is φ = 60978168.

The previous prime is 128731717. The next prime is 128731727. The reversal of 128731726 is 627137821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128731727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1693801 + ... + 1693876.

It is an arithmetic number, because the mean of its divisors is an integer number (25407585).

Almost surely, 2^128731726 is an apocalyptic number.

128731726 is a deficient number, since it is larger than the sum of its proper divisors (74528954).

128731726 is a wasteful number, since it uses less digits than its factorization.

128731726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3387698.

The product of its digits is 28224, while the sum is 37.

The square root of 128731726 is about 11346.0004406839. Note that the first 3 decimals coincide. The cubic root of 128731726 is about 504.9269260015.

The spelling of 128731726 in words is "one hundred twenty-eight million, seven hundred thirty-one thousand, seven hundred twenty-six".