81196736 has 56 divisors (see below), whose sum is σ = 165908736. Its totient is φ = 39415040.

The previous prime is 81196721. The next prime is 81196793. The reversal of 81196736 is 63769118.

It is a junction number, because it is equal to n+sod(n) for n = 81196693 and 81196702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486125 + ... + 486291.

It is an arithmetic number, because the mean of its divisors is an integer number (2962656).

Almost surely, 2^81196736 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 81196736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82954368).

81196736 is an abundant number, since it is smaller than the sum of its proper divisors (84712000).

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

81196736 is a wasteful number, since it uses less digits than its factorization.

81196736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 347 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 81196736 is about 9010.9231491563. The cubic root of 81196736 is about 433.0248871408.

The spelling of 81196736 in words is "eighty-one million, one hundred ninety-six thousand, seven hundred thirty-six".