81263936 has 28 divisors (see below), whose sum is σ = 173664372. Its totient is φ = 37506048.

The previous prime is 81263911. The next prime is 81263939. The reversal of 81263936 is 63936218.

It can be written as a sum of positive squares in 2 ways, for example, as 42823936 + 38440000 = 6544^2 + 6200^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81263936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81263939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48005 + ... + 49668.

It is an arithmetic number, because the mean of its divisors is an integer number (6202299).

Almost surely, 2^81263936 is an apocalyptic number.

It is an amenable number.

81263936 is an abundant number, since it is smaller than the sum of its proper divisors (92400436).

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

81263936 is a wasteful number, since it uses less digits than its factorization.

81263936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97698 (or 97688 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 81263936 is about 9014.6511857087. The cubic root of 81263936 is about 433.1443141434.

The spelling of 81263936 in words is "eighty-one million, two hundred sixty-three thousand, nine hundred thirty-six".