81005762 has 16 divisors (see below), whose sum is σ = 122824512. Its totient is φ = 40066800.

The previous prime is 81005719. The next prime is 81005779. The reversal of 81005762 is 26750018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104408 + ... + 105180.

It is an arithmetic number, because the mean of its divisors is an integer number (7676532).

Almost surely, 2^81005762 is an apocalyptic number.

81005762 is a deficient number, since it is larger than the sum of its proper divisors (41818750).

81005762 is a wasteful number, since it uses less digits than its factorization.

81005762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 81005762 is about 9000.3201054185. The cubic root of 81005762 is about 432.6851304070.

The spelling of 81005762 in words is "eighty-one million, five thousand, seven hundred sixty-two".