81967623 has 8 divisors (see below), whose sum is σ = 109335168. Its totient is φ = 54622584.

The previous prime is 81967609. The next prime is 81967631. The reversal of 81967623 is 32676918.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81967623 - 2⁶ = 81967559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81967603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6790 + ... + 14492.

It is an arithmetic number, because the mean of its divisors is an integer number (13666896).

Almost surely, 2^81967623 is an apocalyptic number.

81967623 is a deficient number, since it is larger than the sum of its proper divisors (27367545).

81967623 is a wasteful number, since it uses less digits than its factorization.

81967623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11253.

The product of its digits is 108864, while the sum is 42.

The square root of 81967623 is about 9053.5972408761. The cubic root of 81967623 is about 434.3909616687.

The spelling of 81967623 in words is "eighty-one million, nine hundred sixty-seven thousand, six hundred twenty-three".