81320867 has 8 divisors (see below), whose sum is σ = 82399680. Its totient is φ = 80248320.

The previous prime is 81320807. The next prime is 81320873. The reversal of 81320867 is 76802318.

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

It is a cyclic number.

It is not a de Polignac number, because 81320867 - 2⁶ = 81320803 is a prime.

It is a super-2 number, since 2×81320867² = 13226166819263378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81320807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28163 + ... + 30915.

It is an arithmetic number, because the mean of its divisors is an integer number (10299960).

Almost surely, 2^81320867 is an apocalyptic number.

81320867 is a deficient number, since it is larger than the sum of its proper divisors (1078813).

81320867 is a wasteful number, since it uses less digits than its factorization.

81320867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3133.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 81320867 is about 9017.8083257519. The cubic root of 81320867 is about 433.2454397016.

The spelling of 81320867 in words is "eighty-one million, three hundred twenty thousand, eight hundred sixty-seven".