81736336 has 80 divisors (see below), whose sum is σ = 181702656. Its totient is φ = 35280000.

The previous prime is 81736331. The next prime is 81736339. The reversal of 81736336 is 63363718.

It is a junction number, because it is equal to n+sod(n) for n = 81736295 and 81736304.

It is not an unprimeable number, because it can be changed into a prime (81736331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 387271 + ... + 387481.

Almost surely, 2^81736336 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 81736336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90851328).

81736336 is an abundant number, since it is smaller than the sum of its proper divisors (99966320).

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

81736336 is a wasteful number, since it uses less digits than its factorization.

81736336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 326 counting only the distinct ones).

The product of its digits is 54432, while the sum is 37.

The square root of 81736336 is about 9040.8150075090. The cubic root of 81736336 is about 433.9820049594.

The spelling of 81736336 in words is "eighty-one million, seven hundred thirty-six thousand, three hundred thirty-six".