81241336 has 96 divisors (see below), whose sum is σ = 180986400. Its totient is φ = 34073600.

The previous prime is 81241331. The next prime is 81241337. The reversal of 81241336 is 63314218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81241331) 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, 912780 + ... + 912868.

It is an arithmetic number, because the mean of its divisors is an integer number (1885275).

Almost surely, 2^81241336 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 81241336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90493200).

81241336 is an abundant number, since it is smaller than the sum of its proper divisors (99745064).

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

81241336 is a wasteful number, since it uses less digits than its factorization.

81241336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 166 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 81241336 is about 9013.3975835974. The cubic root of 81241336 is about 433.1041570553.

The spelling of 81241336 in words is "eighty-one million, two hundred forty-one thousand, three hundred thirty-six".