81007536 has 20 divisors (see below), whose sum is σ = 209269592. Its totient is φ = 27002496.

The previous prime is 81007529. The next prime is 81007559. The reversal of 81007536 is 63570018.

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 3 ways as a sum of consecutive naturals, for example, 843781 + ... + 843876.

Almost surely, 2^81007536 is an apocalyptic number.

It is an amenable number.

81007536 is an abundant number, since it is smaller than the sum of its proper divisors (128262056).

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

81007536 is a wasteful number, since it uses less digits than its factorization.

81007536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687668 (or 1687662 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 81007536 is about 9000.4186569292. The cubic root of 81007536 is about 432.6882889388.

The spelling of 81007536 in words is "eighty-one million, seven thousand, five hundred thirty-six".