81282793 has 8 divisors (see below), whose sum is σ = 81931520. Its totient is φ = 80637120.

The previous prime is 81282781. The next prime is 81282809. The reversal of 81282793 is 39728218.

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-81282793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81282743) 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, 87988 + ... + 88906.

It is an arithmetic number, because the mean of its divisors is an integer number (10241440).

Almost surely, 2^81282793 is an apocalyptic number.

It is an amenable number.

81282793 is a deficient number, since it is larger than the sum of its proper divisors (648727).

81282793 is a wasteful number, since it uses less digits than its factorization.

81282793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527.

The product of its digits is 48384, while the sum is 40.

The square root of 81282793 is about 9015.6970335077. The cubic root of 81282793 is about 433.1778147384.

The spelling of 81282793 in words is "eighty-one million, two hundred eighty-two thousand, seven hundred ninety-three".