81082799 has 16 divisors (see below), whose sum is σ = 97128000. Its totient is φ = 67610592.

The previous prime is 81082777. The next prime is 81082801. The reversal of 81082799 is 99728018.

It is not a de Polignac number, because 81082799 - 2¹⁶ = 81017263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81082759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9497 + ... + 15885.

It is an arithmetic number, because the mean of its divisors is an integer number (6070500).

Almost surely, 2^81082799 is an apocalyptic number.

81082799 is a deficient number, since it is larger than the sum of its proper divisors (16045201).

81082799 is an equidigital number, since it uses as much as digits as its factorization.

81082799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6447 (or 6433 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 81082799 is about 9004.5987695177. The cubic root of 81082799 is about 432.8222490621.

The spelling of 81082799 in words is "eighty-one million, eighty-two thousand, seven hundred ninety-nine".