85661867 has 4 divisors (see below), whose sum is σ = 89386320. Its totient is φ = 81937416.

The previous prime is 85661857. The next prime is 85661909. The reversal of 85661867 is 76816658.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85661867 - 2⁶ = 85661803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85661857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1862192 + ... + 1862237.

It is an arithmetic number, because the mean of its divisors is an integer number (22346580).

Almost surely, 2^85661867 is an apocalyptic number.

85661867 is a deficient number, since it is larger than the sum of its proper divisors (3724453).

85661867 is a wasteful number, since it uses less digits than its factorization.

85661867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724452.

The product of its digits is 483840, while the sum is 47.

The square root of 85661867 is about 9255.3696306523. The cubic root of 85661867 is about 440.8212399996.

The spelling of 85661867 in words is "eighty-five million, six hundred sixty-one thousand, eight hundred sixty-seven".