81367192 has 32 divisors (see below), whose sum is σ = 160696800. Its totient is φ = 38548224.

The previous prime is 81367163. The next prime is 81367211. The reversal of 81367192 is 29176318.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18028 + ... + 22084.

It is an arithmetic number, because the mean of its divisors is an integer number (5021775).

Almost surely, 2^81367192 is an apocalyptic number.

It is an amenable number.

81367192 is a deficient number, since it is larger than the sum of its proper divisors (79329608).

81367192 is a wasteful number, since it uses less digits than its factorization.

81367192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4195 (or 4191 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 81367192 is about 9020.3764888169. The cubic root of 81367192 is about 433.3276911823.

The spelling of 81367192 in words is "eighty-one million, three hundred sixty-seven thousand, one hundred ninety-two".