86891806 has 4 divisors (see below), whose sum is σ = 130337712. Its totient is φ = 43445902.

The previous prime is 86891789. The next prime is 86891809. The reversal of 86891806 is 60819868.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86891809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21722950 + ... + 21722953.

It is an arithmetic number, because the mean of its divisors is an integer number (32584428).

Almost surely, 2^86891806 is an apocalyptic number.

86891806 is a deficient number, since it is larger than the sum of its proper divisors (43445906).

86891806 is a wasteful number, since it uses less digits than its factorization.

86891806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43445905.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 86891806 is about 9321.5774416136. The cubic root of 86891806 is about 442.9210029211.

The spelling of 86891806 in words is "eighty-six million, eight hundred ninety-one thousand, eight hundred six".