85811816 has 8 divisors (see below), whose sum is σ = 160897170. Its totient is φ = 42905904.

The previous prime is 85811777. The next prime is 85811849. The reversal of 85811816 is 61811858.

It can be written as a sum of positive squares in only one way, i.e., 75864100 + 9947716 = 8710^2 + 3154^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 85811816.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5363231 + ... + 5363246.

Almost surely, 2^85811816 is an apocalyptic number.

It is an amenable number.

85811816 is a deficient number, since it is larger than the sum of its proper divisors (75085354).

85811816 is a wasteful number, since it uses less digits than its factorization.

85811816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10726483 (or 10726479 counting only the distinct ones).

The product of its digits is 15360, while the sum is 38.

The square root of 85811816 is about 9263.4667376744. The cubic root of 85811816 is about 441.0783056566.

The spelling of 85811816 in words is "eighty-five million, eight hundred eleven thousand, eight hundred sixteen".