84428669 has 4 divisors (see below), whose sum is σ = 90923196. Its totient is φ = 77934144.

The previous prime is 84428639. The next prime is 84428683. The reversal of 84428669 is 96682448.

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 57002500 + 27426169 = 7550^2 + 5237^2 .

It is a cyclic number.

It is not a de Polignac number, because 84428669 - 2¹⁶ = 84363133 is a prime.

It is a super-2 number, since 2×84428669² = 14256400298223122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84428639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3247244 + ... + 3247269.

It is an arithmetic number, because the mean of its divisors is an integer number (22730799).

Almost surely, 2^84428669 is an apocalyptic number.

It is an amenable number.

84428669 is a deficient number, since it is larger than the sum of its proper divisors (6494527).

84428669 is a wasteful number, since it uses less digits than its factorization.

84428669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6494526.

The product of its digits is 663552, while the sum is 47.

The square root of 84428669 is about 9188.5074413639. The cubic root of 84428669 is about 438.6956360485.

The spelling of 84428669 in words is "eighty-four million, four hundred twenty-eight thousand, six hundred sixty-nine".