80807857 has 8 divisors (see below), whose sum is σ = 87541160. Its totient is φ = 74589840.

The previous prime is 80807827. The next prime is 80807863. The reversal of 80807857 is 75870808.

It can be written as a sum of positive squares in 4 ways, for example, as 52548001 + 28259856 = 7249^2 + 5316^2 .

It is a de Polignac number, because none of the positive numbers 2^k-80807857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80807827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16194 + ... + 20587.

It is an arithmetic number, because the mean of its divisors is an integer number (10942645).

Almost surely, 2^80807857 is an apocalyptic number.

It is an amenable number.

80807857 is a deficient number, since it is larger than the sum of its proper divisors (6733303).

80807857 is an equidigital number, since it uses as much as digits as its factorization.

80807857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36820 (or 36794 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 43.

The square root of 80807857 is about 8989.3190509626. The cubic root of 80807857 is about 432.3324790317.

The spelling of 80807857 in words is "eighty million, eight hundred seven thousand, eight hundred fifty-seven".