80321805 has 12 divisors (see below), whose sum is σ = 139224540. Its totient is φ = 42838272.

The previous prime is 80321779. The next prime is 80321831. The reversal of 80321805 is 50812308.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (80321779) and next prime (80321831).

It can be written as a sum of positive squares in 2 ways, for example, as 61685316 + 18636489 = 7854^2 + 4317^2 .

It is not a de Polignac number, because 80321805 - 2⁶ = 80321741 is a prime.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 892420 + ... + 892509.

It is an arithmetic number, because the mean of its divisors is an integer number (11602045).

Almost surely, 2^80321805 is an apocalyptic number.

It is an amenable number.

80321805 is a deficient number, since it is larger than the sum of its proper divisors (58902735).

80321805 is a wasteful number, since it uses less digits than its factorization.

80321805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784940 (or 1784937 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 80321805 is about 8962.2433017632. The cubic root of 80321805 is about 431.4639215919.

The spelling of 80321805 in words is "eighty million, three hundred twenty-one thousand, eight hundred five".