81035636 has 18 divisors (see below), whose sum is σ = 155877330. Its totient is φ = 36834160.

The previous prime is 81035609. The next prime is 81035659. The reversal of 81035636 is 63653018.

It can be written as a sum of positive squares in only one way, i.e., 76667536 + 4368100 = 8756^2 + 2090^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 83231 + ... + 84198.

Almost surely, 2^81035636 is an apocalyptic number.

It is an amenable number.

81035636 is a deficient number, since it is larger than the sum of its proper divisors (74841694).

81035636 is a wasteful number, since it uses less digits than its factorization.

81035636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167455 (or 167442 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 81035636 is about 9001.9795600746. The cubic root of 81035636 is about 432.7383136481.

The spelling of 81035636 in words is "eighty-one million, thirty-five thousand, six hundred thirty-six".