128766729 has 16 divisors (see below), whose sum is σ = 211309952. Its totient is φ = 67920768.

The previous prime is 128766709. The next prime is 128766739. The reversal of 128766729 is 927667821.

It is not a de Polignac number, because 128766729 - 2⁷ = 128766601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128766709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235564 + ... + 236109.

It is an arithmetic number, because the mean of its divisors is an integer number (13206872).

Almost surely, 2^128766729 is an apocalyptic number.

It is an amenable number.

128766729 is a deficient number, since it is larger than the sum of its proper divisors (82543223).

128766729 is a wasteful number, since it uses less digits than its factorization.

128766729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471696.

The product of its digits is 508032, while the sum is 48.

The square root of 128766729 is about 11347.5428617829. The cubic root of 128766729 is about 504.9726861677.

The spelling of 128766729 in words is "one hundred twenty-eight million, seven hundred sixty-six thousand, seven hundred twenty-nine".