81008386 has 16 divisors (see below), whose sum is σ = 123409440. Its totient is φ = 39876480.

The previous prime is 81008377. The next prime is 81008387. The reversal of 81008386 is 68380018.

It is not an unprimeable number, because it can be changed into a prime (81008387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39945 + ... + 41923.

It is an arithmetic number, because the mean of its divisors is an integer number (7713090).

Almost surely, 2^81008386 is an apocalyptic number.

81008386 is a deficient number, since it is larger than the sum of its proper divisors (42401054).

81008386 is a wasteful number, since it uses less digits than its factorization.

81008386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 81008386 is about 9000.4658768310. The cubic root of 81008386 is about 432.6898023114.

The spelling of 81008386 in words is "eighty-one million, eight thousand, three hundred eighty-six".