81271762 has 24 divisors (see below), whose sum is σ = 144013680. Its totient is φ = 34098480.

The previous prime is 81271753. The next prime is 81271769. The reversal of 81271762 is 26717218.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81271769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7212 + ... + 14647.

It is an arithmetic number, because the mean of its divisors is an integer number (6000570).

Almost surely, 2^81271762 is an apocalyptic number.

81271762 is a deficient number, since it is larger than the sum of its proper divisors (62741918).

81271762 is a wasteful number, since it uses less digits than its factorization.

81271762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21898 (or 21885 counting only the distinct ones).

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

The square root of 81271762 is about 9015.0852464078. The cubic root of 81271762 is about 433.1582181323.

It can be divided in two parts, 8127 and 1762, that added together give a palindrome (9889).

The spelling of 81271762 in words is "eighty-one million, two hundred seventy-one thousand, seven hundred sixty-two".