80785817 has 4 divisors (see below), whose sum is σ = 92326656. Its totient is φ = 69244980.

The previous prime is 80785813. The next prime is 80785829. The reversal of 80785817 is 71858708.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 80785817 - 2² = 80785813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80785813) 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, 5770409 + ... + 5770422.

It is an arithmetic number, because the mean of its divisors is an integer number (23081664).

Almost surely, 2^80785817 is an apocalyptic number.

It is an amenable number.

80785817 is a deficient number, since it is larger than the sum of its proper divisors (11540839).

80785817 is a wasteful number, since it uses less digits than its factorization.

80785817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11540838.

The product of its (nonzero) digits is 125440, while the sum is 44.

The square root of 80785817 is about 8988.0930680540. The cubic root of 80785817 is about 432.2931698415.

The spelling of 80785817 in words is "eighty million, seven hundred eighty-five thousand, eight hundred seventeen".