8128669 has 4 divisors (see below), whose sum is σ = 8606844. Its totient is φ = 7650496.

The previous prime is 8128667. The next prime is 8128691. The reversal of 8128669 is 9668218.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7496644 + 632025 = 2738^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 8128669 - 2¹ = 8128667 is a prime.

It is a super-2 number, since 2×8128669² = 132150519423122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8128667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239062 + ... + 239095.

It is an arithmetic number, because the mean of its divisors is an integer number (2151711).

Almost surely, 2^8128669 is an apocalyptic number.

It is an amenable number.

8128669 is a deficient number, since it is larger than the sum of its proper divisors (478175).

8128669 is a wasteful number, since it uses less digits than its factorization.

8128669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478174.

The product of its digits is 41472, while the sum is 40.

The square root of 8128669 is about 2851.0820752830. The cubic root of 8128669 is about 201.0665439763.

The spelling of 8128669 in words is "eight million, one hundred twenty-eight thousand, six hundred sixty-nine".