81282874 has 16 divisors (see below), whose sum is σ = 133922880. Its totient is φ = 36828000.

The previous prime is 81282841. The next prime is 81282907. The reversal of 81282874 is 47828218.

It is an interprime number because it is at equal distance from previous prime (81282841) and next prime (81282907).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 45627 + ... + 47374.

It is an arithmetic number, because the mean of its divisors is an integer number (8370180).

Almost surely, 2^81282874 is an apocalyptic number.

81282874 is a deficient number, since it is larger than the sum of its proper divisors (52640006).

81282874 is a wasteful number, since it uses less digits than its factorization.

81282874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93045.

The product of its digits is 57344, while the sum is 40.

The square root of 81282874 is about 9015.7015256718. The cubic root of 81282874 is about 433.1779586286.

Subtracting from 81282874 its reverse (47828218), we obtain a square (33454656 = 5784²).

The spelling of 81282874 in words is "eighty-one million, two hundred eighty-two thousand, eight hundred seventy-four".