80249789 has 4 divisors (see below), whose sum is σ = 80693340. Its totient is φ = 79806240.

The previous prime is 80249777. The next prime is 80249861. The reversal of 80249789 is 98794208.

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 14364100 + 65885689 = 3790^2 + 8117^2 .

It is a cyclic number.

It is not a de Polignac number, because 80249789 - 2⁴ = 80249773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80249089) 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, 221504 + ... + 221865.

It is an arithmetic number, because the mean of its divisors is an integer number (20173335).

Almost surely, 2^80249789 is an apocalyptic number.

It is an amenable number.

80249789 is a deficient number, since it is larger than the sum of its proper divisors (443551).

80249789 is a wasteful number, since it uses less digits than its factorization.

80249789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443550.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 80249789 is about 8958.2246567051. The cubic root of 80249789 is about 431.3349338000.

The spelling of 80249789 in words is "eighty million, two hundred forty-nine thousand, seven hundred eighty-nine".