80799869 has 4 divisors (see below), whose sum is σ = 81342300. Its totient is φ = 80257440.

The previous prime is 80799853. The next prime is 80799907. The reversal of 80799869 is 96899708.

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 4674244 + 76125625 = 2162^2 + 8725^2 .

It is a cyclic number.

It is not a de Polignac number, because 80799869 - 2⁴ = 80799853 is a prime.

It is a super-2 number, since 2×80799869² = 13057237660834322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80799809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270992 + ... + 271289.

It is an arithmetic number, because the mean of its divisors is an integer number (20335575).

Almost surely, 2^80799869 is an apocalyptic number.

It is an amenable number.

80799869 is a deficient number, since it is larger than the sum of its proper divisors (542431).

80799869 is a wasteful number, since it uses less digits than its factorization.

80799869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542430.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 80799869 is about 8988.8747349154. The cubic root of 80799869 is about 432.3182329514.

The spelling of 80799869 in words is "eighty million, seven hundred ninety-nine thousand, eight hundred sixty-nine".