81227685 has 32 divisors (see below), whose sum is σ = 162035712. Its totient is φ = 33756480.

The previous prime is 81227669. The next prime is 81227687. The reversal of 81227685 is 58672218.

It is not a de Polignac number, because 81227685 - 2⁴ = 81227669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81227687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34009 + ... + 36318.

It is an arithmetic number, because the mean of its divisors is an integer number (5063616).

Almost surely, 2^81227685 is an apocalyptic number.

It is an amenable number.

81227685 is a deficient number, since it is larger than the sum of its proper divisors (80808027).

81227685 is a wasteful number, since it uses less digits than its factorization.

81227685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70353.

The product of its digits is 53760, while the sum is 39.

The square root of 81227685 is about 9012.6402901702. The cubic root of 81227685 is about 433.0798975001.

The spelling of 81227685 in words is "eighty-one million, two hundred twenty-seven thousand, six hundred eighty-five".