80785805 has 4 divisors (see below), whose sum is σ = 96942972. Its totient is φ = 64628640.

The previous prime is 80785801. The next prime is 80785813. The reversal of 80785805 is 50858708.

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 56942116 + 23843689 = 7546^2 + 4883^2 .

It is not a de Polignac number, because 80785805 - 2² = 80785801 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80785801) 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, 8078576 + ... + 8078585.

It is an arithmetic number, because the mean of its divisors is an integer number (24235743).

Almost surely, 2^80785805 is an apocalyptic number.

It is an amenable number.

80785805 is a deficient number, since it is larger than the sum of its proper divisors (16157167).

80785805 is a wasteful number, since it uses less digits than its factorization.

80785805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16157166.

The product of its (nonzero) digits is 89600, while the sum is 41.

The square root of 80785805 is about 8988.0924005041. The cubic root of 80785805 is about 432.2931484370.

The spelling of 80785805 in words is "eighty million, seven hundred eighty-five thousand, eight hundred five".