81767882 has 8 divisors (see below), whose sum is σ = 140173536. Its totient is φ = 35043372.

The previous prime is 81767869. The next prime is 81767911. The reversal of 81767882 is 28876718.

It is a happy number.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2920268 + ... + 2920295.

It is an arithmetic number, because the mean of its divisors is an integer number (17521692).

Almost surely, 2^81767882 is an apocalyptic number.

81767882 is a deficient number, since it is larger than the sum of its proper divisors (58405654).

81767882 is a wasteful number, since it uses less digits than its factorization.

81767882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5840572.

The product of its digits is 301056, while the sum is 47.

The square root of 81767882 is about 9042.5594828013. The cubic root of 81767882 is about 434.0378293174.

The spelling of 81767882 in words is "eighty-one million, seven hundred sixty-seven thousand, eight hundred eighty-two".