81281276 has 12 divisors (see below), whose sum is σ = 142360680. Its totient is φ = 40606800.

The previous prime is 81281269. The next prime is 81281281. The reversal of 81281276 is 67218218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2606 + ... + 13013.

It is an arithmetic number, because the mean of its divisors is an integer number (11863390).

Almost surely, 2^81281276 is an apocalyptic number.

It is an amenable number.

81281276 is a deficient number, since it is larger than the sum of its proper divisors (61079404).

81281276 is a wasteful number, since it uses less digits than its factorization.

81281276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16924 (or 16922 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 81281276 is about 9015.6129020716. The cubic root of 81281276 is about 433.1751198883.

The spelling of 81281276 in words is "eighty-one million, two hundred eighty-one thousand, two hundred seventy-six".