81013936 has 20 divisors (see below), whose sum is σ = 162378000. Its totient is φ = 39109952.

The previous prime is 81013927. The next prime is 81013939. The reversal of 81013936 is 63931018.

It is a junction number, because it is equal to n+sod(n) for n = 81013898 and 81013907.

It is not an unprimeable number, because it can be changed into a prime (81013939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86836 + ... + 87763.

It is an arithmetic number, because the mean of its divisors is an integer number (8118900).

Almost surely, 2^81013936 is an apocalyptic number.

It is an amenable number.

81013936 is an abundant number, since it is smaller than the sum of its proper divisors (81364064).

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

81013936 is a wasteful number, since it uses less digits than its factorization.

81013936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174636 (or 174630 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 81013936 is about 9000.7741889240. The cubic root of 81013936 is about 432.6996834841.

The spelling of 81013936 in words is "eighty-one million, thirteen thousand, nine hundred thirty-six".