81320767 has 8 divisors (see below), whose sum is σ = 89413632. Its totient is φ = 73344600.

The previous prime is 81320761. The next prime is 81320791. The reversal of 81320767 is 76702318.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81320767 is a prime.

It is a super-3 number, since 3×81320767³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81320761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27709 + ... + 30502.

It is an arithmetic number, because the mean of its divisors is an integer number (11176704).

Almost surely, 2^81320767 is an apocalyptic number.

81320767 is a deficient number, since it is larger than the sum of its proper divisors (8092865).

81320767 is a wasteful number, since it uses less digits than its factorization.

81320767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58349.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 81320767 is about 9017.8027811657. The cubic root of 81320767 is about 433.2452621147.

The spelling of 81320767 in words is "eighty-one million, three hundred twenty thousand, seven hundred sixty-seven".