81272671 has 8 divisors (see below), whose sum is σ = 85910000. Its totient is φ = 76671360.

The previous prime is 81272663. The next prime is 81272693. The reversal of 81272671 is 17627218.

It is a happy number.

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 81272671 - 2³ = 81272663 is a prime.

It is a super-4 number, since 4×81272671⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81272371) 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, 4296 + ... + 13453.

It is an arithmetic number, because the mean of its divisors is an integer number (10738750).

Almost surely, 2^81272671 is an apocalyptic number.

81272671 is a deficient number, since it is larger than the sum of its proper divisors (4637329).

81272671 is a wasteful number, since it uses less digits than its factorization.

81272671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18009.

The product of its digits is 9408, while the sum is 34.

The square root of 81272671 is about 9015.1356617635. The cubic root of 81272671 is about 433.1598330407.

Adding to 81272671 its reverse (17627218), we get a palindrome (98899889).

The spelling of 81272671 in words is "eighty-one million, two hundred seventy-two thousand, six hundred seventy-one".