81850338 has 40 divisors (see below), whose sum is σ = 186885468. Its totient is φ = 26765856.

The previous prime is 81850331. The next prime is 81850343. The reversal of 81850338 is 83305818.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 81486729 + 363609 = 9027^2 + 603^2 .

It is not an unprimeable number, because it can be changed into a prime (81850331) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3820 + ... + 13352.

Almost surely, 2^81850338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81850338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93442734).

81850338 is an abundant number, since it is smaller than the sum of its proper divisors (105035130).

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

81850338 is a wasteful number, since it uses less digits than its factorization.

81850338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9600 (or 9591 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 81850338 is about 9047.1176625487. The cubic root of 81850338 is about 434.1836771289.

The spelling of 81850338 in words is "eighty-one million, eight hundred fifty thousand, three hundred thirty-eight".