81895964 has 12 divisors (see below), whose sum is σ = 143403288. Its totient is φ = 40923600.

The previous prime is 81895963. The next prime is 81895969. The reversal of 81895964 is 46959818.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81895963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2954 + ... + 13134.

It is an arithmetic number, because the mean of its divisors is an integer number (11950274).

Almost surely, 2^81895964 is an apocalyptic number.

It is an amenable number.

81895964 is a deficient number, since it is larger than the sum of its proper divisors (61507324).

81895964 is a wasteful number, since it uses less digits than its factorization.

81895964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12196 (or 12194 counting only the distinct ones).

The product of its digits is 622080, while the sum is 50.

The square root of 81895964 is about 9049.6388878231. The cubic root of 81895964 is about 434.2643381058.

The spelling of 81895964 in words is "eighty-one million, eight hundred ninety-five thousand, nine hundred sixty-four".