81867683 has 4 divisors (see below), whose sum is σ = 84508608. Its totient is φ = 79226760.

The previous prime is 81867679. The next prime is 81867691. The reversal of 81867683 is 38676818.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81867683 - 2² = 81867679 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81867613) 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 3 ways as a sum of consecutive naturals, for example, 1320416 + ... + 1320477.

It is an arithmetic number, because the mean of its divisors is an integer number (21127152).

Almost surely, 2^81867683 is an apocalyptic number.

81867683 is a deficient number, since it is larger than the sum of its proper divisors (2640925).

81867683 is a wasteful number, since it uses less digits than its factorization.

81867683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640924.

The product of its digits is 387072, while the sum is 47.

The square root of 81867683 is about 9048.0762043652. The cubic root of 81867683 is about 434.2143444182.

The spelling of 81867683 in words is "eighty-one million, eight hundred sixty-seven thousand, six hundred eighty-three".