81340082 has 4 divisors (see below), whose sum is σ = 122010126. Its totient is φ = 40670040.

The previous prime is 81340081. The next prime is 81340117. The reversal of 81340082 is 28004318.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 45711121 + 35628961 = 6761^2 + 5969^2 .

It is not an unprimeable number, because it can be changed into a prime (81340081) 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 as a sum of consecutive naturals, namely, 20335019 + ... + 20335022.

Almost surely, 2^81340082 is an apocalyptic number.

81340082 is a deficient number, since it is larger than the sum of its proper divisors (40670044).

81340082 is a wasteful number, since it uses less digits than its factorization.

81340082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40670043.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 81340082 is about 9018.8736547309. The cubic root of 81340082 is about 433.2795603229.

The spelling of 81340082 in words is "eighty-one million, three hundred forty thousand, eighty-two".