85817818 has 8 divisors (see below), whose sum is σ = 128789748. Its totient is φ = 42887904.

The previous prime is 85817803. The next prime is 85817839. The reversal of 85817818 is 81871858.

It can be written as a sum of positive squares in 2 ways, for example, as 85618009 + 199809 = 9253^2 + 447^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×85817818² = 14729395772562248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4771 + ... + 13942.

Almost surely, 2^85817818 is an apocalyptic number.

85817818 is a deficient number, since it is larger than the sum of its proper divisors (42971930).

85817818 is a wasteful number, since it uses less digits than its factorization.

85817818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21008.

The product of its digits is 143360, while the sum is 46.

The square root of 85817818 is about 9263.7906927996. The cubic root of 85817818 is about 441.0885889734.

The spelling of 85817818 in words is "eighty-five million, eight hundred seventeen thousand, eight hundred eighteen".