128786669 has 8 divisors (see below), whose sum is σ = 142273920. Its totient is φ = 115596000.

The previous prime is 128786659. The next prime is 128786681. The reversal of 128786669 is 966687821.

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

It is a cyclic number.

It is not a de Polignac number, because 128786669 - 2⁴ = 128786653 is a prime.

It is a super-2 number, since 2×128786669² = 33172012224231122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128786669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128786659) 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, 73232 + ... + 74969.

It is an arithmetic number, because the mean of its divisors is an integer number (17784240).

Almost surely, 2^128786669 is an apocalyptic number.

It is an amenable number.

128786669 is a deficient number, since it is larger than the sum of its proper divisors (13487251).

128786669 is a wasteful number, since it uses less digits than its factorization.

128786669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148291.

The product of its digits is 1741824, while the sum is 53.

The square root of 128786669 is about 11348.4214320759. The cubic root of 128786669 is about 504.9987504462.

The spelling of 128786669 in words is "one hundred twenty-eight million, seven hundred eighty-six thousand, six hundred sixty-nine".