81817082 has 8 divisors (see below), whose sum is σ = 123010356. Its totient is φ = 40813632.

The previous prime is 81817081. The next prime is 81817093. The reversal of 81817082 is 28071818.

It can be written as a sum of positive squares in 2 ways, for example, as 81342361 + 474721 = 9019^2 + 689^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81817081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46373 + ... + 48104.

Almost surely, 2^81817082 is an apocalyptic number.

81817082 is a deficient number, since it is larger than the sum of its proper divisors (41193274).

81817082 is a wasteful number, since it uses less digits than its factorization.

81817082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94912.

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 81817082 is about 9045.2795423912. The cubic root of 81817082 is about 434.1248658532.

The spelling of 81817082 in words is "eighty-one million, eight hundred seventeen thousand, eighty-two".