81068838 has 16 divisors (see below), whose sum is σ = 163076976. Its totient is φ = 26866400.

The previous prime is 81068789. The next prime is 81068857. The reversal of 81068838 is 83886018.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81068838.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38013 + ... + 40088.

It is an arithmetic number, because the mean of its divisors is an integer number (10192311).

Almost surely, 2^81068838 is an apocalyptic number.

81068838 is an abundant number, since it is smaller than the sum of its proper divisors (82008138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81068838 is a wasteful number, since it uses less digits than its factorization.

81068838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78279.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 81068838 is about 9003.8235211492. The cubic root of 81068838 is about 432.7974062334.

The spelling of 81068838 in words is "eighty-one million, sixty-eight thousand, eight hundred thirty-eight".