128726751 has 4 divisors (see below), whose sum is σ = 171635672. Its totient is φ = 85817832.

The previous prime is 128726743. The next prime is 128726753. The reversal of 128726751 is 157627821.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 128726751 - 2³ = 128726743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128726753) 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, 21454456 + ... + 21454461.

It is an arithmetic number, because the mean of its divisors is an integer number (42908918).

Almost surely, 2^128726751 is an apocalyptic number.

128726751 is a deficient number, since it is larger than the sum of its proper divisors (42908921).

128726751 is an equidigital number, since it uses as much as digits as its factorization.

128726751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42908920.

The product of its digits is 47040, while the sum is 39.

The square root of 128726751 is about 11345.7811983133. The cubic root of 128726751 is about 504.9204214049.

The spelling of 128726751 in words is "one hundred twenty-eight million, seven hundred twenty-six thousand, seven hundred fifty-one".