128669683 has 4 divisors (see below), whose sum is σ = 132147280. Its totient is φ = 125192088.

The previous prime is 128669647. The next prime is 128669701. The reversal of 128669683 is 386966821.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128669683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128669183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1738743 + ... + 1738816.

It is an arithmetic number, because the mean of its divisors is an integer number (33036820).

Almost surely, 2^128669683 is an apocalyptic number.

128669683 is a deficient number, since it is larger than the sum of its proper divisors (3477597).

128669683 is an equidigital number, since it uses as much as digits as its factorization.

128669683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477596.

The product of its digits is 746496, while the sum is 49.

The square root of 128669683 is about 11343.2659758995. The cubic root of 128669683 is about 504.8457954821.

The spelling of 128669683 in words is "one hundred twenty-eight million, six hundred sixty-nine thousand, six hundred eighty-three".