81838008 has 96 divisors (see below), whose sum is σ = 256988160. Its totient is φ = 23042880.

The previous prime is 81838007. The next prime is 81838013. The reversal of 81838008 is 80083818.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81838007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34641 + ... + 36927.

It is an arithmetic number, because the mean of its divisors is an integer number (2676960).

Almost surely, 2^81838008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81838008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128494080).

81838008 is an abundant number, since it is smaller than the sum of its proper divisors (175150152).

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

81838008 is a wasteful number, since it uses less digits than its factorization.

81838008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2377 (or 2370 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 81838008 is about 9046.4362043846. The cubic root of 81838008 is about 434.1618741092.

The spelling of 81838008 in words is "eighty-one million, eight hundred thirty-eight thousand, eight".