128766869 has 12 divisors (see below), whose sum is σ = 161757792. Its totient is φ = 100337160.

The previous prime is 128766809. The next prime is 128766871. The reversal of 128766869 is 968667821.

It is not a de Polignac number, because 128766869 - 2¹² = 128762773 is a prime.

It is a super-2 number, since 2×128766869² = 33161813104126322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128766869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128766809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75167 + ... + 76860.

It is an arithmetic number, because the mean of its divisors is an integer number (13479816).

Almost surely, 2^128766869 is an apocalyptic number.

It is an amenable number.

128766869 is a deficient number, since it is larger than the sum of its proper divisors (32990923).

128766869 is a wasteful number, since it uses less digits than its factorization.

128766869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152056 (or 152045 counting only the distinct ones).

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

The square root of 128766869 is about 11347.5490305176. The cubic root of 128766869 is about 504.9728691760.

The spelling of 128766869 in words is "one hundred twenty-eight million, seven hundred sixty-six thousand, eight hundred sixty-nine".