81471727 has 8 divisors (see below), whose sum is σ = 86823936. Its totient is φ = 76270392.

The previous prime is 81471707. The next prime is 81471739. The reversal of 81471727 is 72717418.

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

It is a de Polignac number, because none of the positive numbers 2^k-81471727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81471707) 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, 36603 + ... + 38764.

It is an arithmetic number, because the mean of its divisors is an integer number (10852992).

Almost surely, 2^81471727 is an apocalyptic number.

81471727 is a deficient number, since it is larger than the sum of its proper divisors (5352209).

81471727 is a wasteful number, since it uses less digits than its factorization.

81471727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75437.

The product of its digits is 21952, while the sum is 37.

The square root of 81471727 is about 9026.1690101615. The cubic root of 81471727 is about 433.5131816909.

The spelling of 81471727 in words is "eighty-one million, four hundred seventy-one thousand, seven hundred twenty-seven".