81927427 has 8 divisors (see below), whose sum is σ = 84016064. Its totient is φ = 79847208.

The previous prime is 81927421. The next prime is 81927431. The reversal of 81927427 is 72472918.

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 81927427 - 2⁷ = 81927299 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 81927427.

It is not an unprimeable number, because it can be changed into a prime (81927421) 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 7 ways as a sum of consecutive naturals, for example, 20668 + ... + 24310.

It is an arithmetic number, because the mean of its divisors is an integer number (10502008).

Almost surely, 2^81927427 is an apocalyptic number.

81927427 is a deficient number, since it is larger than the sum of its proper divisors (2088637).

81927427 is a wasteful number, since it uses less digits than its factorization.

81927427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209.

The product of its digits is 56448, while the sum is 40.

The square root of 81927427 is about 9051.3770775501. The cubic root of 81927427 is about 434.3199432453.

The spelling of 81927427 in words is "eighty-one million, nine hundred twenty-seven thousand, four hundred twenty-seven".