128726786 has 16 divisors (see below), whose sum is σ = 203552160. Its totient is φ = 60886080.

The previous prime is 128726779. The next prime is 128726789. The reversal of 128726786 is 687627821.

It is a self number, because there is not a number n which added to its sum of digits gives 128726786.

It is not an unprimeable number, because it can be changed into a prime (128726789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28730 + ... + 32906.

It is an arithmetic number, because the mean of its divisors is an integer number (12722010).

Almost surely, 2^128726786 is an apocalyptic number.

128726786 is a deficient number, since it is larger than the sum of its proper divisors (74825374).

128726786 is a wasteful number, since it uses less digits than its factorization.

128726786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5009.

The product of its digits is 451584, while the sum is 47.

The square root of 128726786 is about 11345.7827407368. The cubic root of 128726786 is about 504.9204671665.

The spelling of 128726786 in words is "one hundred twenty-eight million, seven hundred twenty-six thousand, seven hundred eighty-six".