81786795 has 16 divisors (see below), whose sum is σ = 131696160. Its totient is φ = 43340544.

The previous prime is 81786767. The next prime is 81786797. The reversal of 81786795 is 59768718.

It is not a de Polignac number, because 81786795 - 2⁵ = 81786763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81786797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15010 + ... + 19719.

It is an arithmetic number, because the mean of its divisors is an integer number (8231010).

Almost surely, 2^81786795 is an apocalyptic number.

81786795 is a deficient number, since it is larger than the sum of its proper divisors (49909365).

81786795 is a wasteful number, since it uses less digits than its factorization.

81786795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34894.

The product of its digits is 846720, while the sum is 51.

The square root of 81786795 is about 9043.6051992554. The cubic root of 81786795 is about 434.0712912115.

The spelling of 81786795 in words is "eighty-one million, seven hundred eighty-six thousand, seven hundred ninety-five".