81727223 has 8 divisors (see below), whose sum is σ = 83281968. Its totient is φ = 80184384.

The previous prime is 81727193. The next prime is 81727231. The reversal of 81727223 is 32272718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81727223 - 2²² = 77532919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81727223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81727273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11540 + ... + 17222.

It is an arithmetic number, because the mean of its divisors is an integer number (10410246).

Almost surely, 2^81727223 is an apocalyptic number.

81727223 is a deficient number, since it is larger than the sum of its proper divisors (1554745).

81727223 is a wasteful number, since it uses less digits than its factorization.

81727223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5953.

The product of its digits is 9408, while the sum is 32.

The square root of 81727223 is about 9040.3110012875. The cubic root of 81727223 is about 433.9658757599.

The spelling of 81727223 in words is "eighty-one million, seven hundred twenty-seven thousand, two hundred twenty-three".