81238806 has 48 divisors (see below), whose sum is σ = 200378880. Its totient is φ = 23546160.

The previous prime is 81238789. The next prime is 81238819. The reversal of 81238806 is 60883218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4366 + ... + 13473.

It is an arithmetic number, because the mean of its divisors is an integer number (4174560).

Almost surely, 2^81238806 is an apocalyptic number.

81238806 is an abundant number, since it is smaller than the sum of its proper divisors (119140074).

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

81238806 is a wasteful number, since it uses less digits than its factorization.

81238806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17881 (or 17878 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 81238806 is about 9013.2572358721. The cubic root of 81238806 is about 433.0996611302.

The spelling of 81238806 in words is "eighty-one million, two hundred thirty-eight thousand, eight hundred six".