128876669 has 2 divisors, whose sum is σ = 128876670. Its totient is φ = 128876668.

The previous prime is 128876663. The next prime is 128876681. The reversal of 128876669 is 966678821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112635769 + 16240900 = 10613^2 + 4030^2 .

It is an emirp because it is prime and its reverse (966678821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128876669 is a prime.

It is a super-2 number, since 2×128876669² = 33218391625071122, 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 128876669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128876663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64438334 + 64438335.

It is an arithmetic number, because the mean of its divisors is an integer number (64438335).

Almost surely, 2^128876669 is an apocalyptic number.

It is an amenable number.

128876669 is a deficient number, since it is larger than the sum of its proper divisors (1).

128876669 is an equidigital number, since it uses as much as digits as its factorization.

128876669 is an odious number, because the sum of its binary digits is odd.

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

The square root of 128876669 is about 11352.3860487564. The cubic root of 128876669 is about 505.1163591624.

The spelling of 128876669 in words is "one hundred twenty-eight million, eight hundred seventy-six thousand, six hundred sixty-nine".