81027536 has 20 divisors (see below), whose sum is σ = 157423332. Its totient is φ = 40402176.

The previous prime is 81027517. The next prime is 81027539. The reversal of 81027536 is 63572018.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 64705936 + 16321600 = 8044^2 + 4040^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81027539) 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, 821 + ... + 12756.

Almost surely, 2^81027536 is an apocalyptic number.

It is an amenable number.

81027536 is a deficient number, since it is larger than the sum of its proper divisors (76395796).

81027536 is a wasteful number, since it uses less digits than its factorization.

81027536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13958 (or 13952 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 81027536 is about 9001.5296477876. The cubic root of 81027536 is about 432.7238949006.

The spelling of 81027536 in words is "eighty-one million, twenty-seven thousand, five hundred thirty-six".