81282256774 has 16 divisors (see below), whose sum is σ = 129159908208. Its totient is φ = 38231345152.

The previous prime is 81282256691. The next prime is 81282256799. The reversal of 81282256774 is 47765228218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528667 + ... + 664870.

It is an arithmetic number, because the mean of its divisors is an integer number (8072494263).

Almost surely, 2^81282256774 is an apocalyptic number.

81282256774 is a deficient number, since it is larger than the sum of its proper divisors (47877651434).

81282256774 is a wasteful number, since it uses less digits than its factorization.

81282256774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195559.

The product of its digits is 3010560, while the sum is 52.

The spelling of 81282256774 in words is "eighty-one billion, two hundred eighty-two million, two hundred fifty-six thousand, seven hundred seventy-four".