80828609 has 4 divisors (see below), whose sum is σ = 83013204. Its totient is φ = 78644016.

The previous prime is 80828581. The next prime is 80828611. The reversal of 80828609 is 90682808.

It is a happy number.

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 76300225 + 4528384 = 8735^2 + 2128^2 .

It is a cyclic number.

It is not a de Polignac number, because 80828609 - 2²⁰ = 79780033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80825609) 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, 1092242 + ... + 1092315.

It is an arithmetic number, because the mean of its divisors is an integer number (20753301).

Almost surely, 2^80828609 is an apocalyptic number.

It is an amenable number.

80828609 is a deficient number, since it is larger than the sum of its proper divisors (2184595).

80828609 is a wasteful number, since it uses less digits than its factorization.

80828609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184594.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 80828609 is about 8990.4732355978. The cubic root of 80828609 is about 432.3694844915.

The spelling of 80828609 in words is "eighty million, eight hundred twenty-eight thousand, six hundred nine".