81967534 has 24 divisors (see below), whose sum is σ = 138630744. Its totient is φ = 36046800.

The previous prime is 81967519. The next prime is 81967541. The reversal of 81967534 is 43576918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19204 + ... + 23080.

It is an arithmetic number, because the mean of its divisors is an integer number (5776281).

Almost surely, 2^81967534 is an apocalyptic number.

81967534 is a deficient number, since it is larger than the sum of its proper divisors (56663210).

81967534 is a wasteful number, since it uses less digits than its factorization.

81967534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3952 (or 3921 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The square root of 81967534 is about 9053.5923257014. The cubic root of 81967534 is about 434.3908044489.

The spelling of 81967534 in words is "eighty-one million, nine hundred sixty-seven thousand, five hundred thirty-four".