81286774 has 16 divisors (see below), whose sum is σ = 126120960. Its totient is φ = 39251880.

The previous prime is 81286763. The next prime is 81286811. The reversal of 81286774 is 47768218.

It is a self number, because there is not a number n which added to its sum of digits gives 81286774.

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, 38847 + ... + 40885.

It is an arithmetic number, because the mean of its divisors is an integer number (7882560).

Almost surely, 2^81286774 is an apocalyptic number.

81286774 is a deficient number, since it is larger than the sum of its proper divisors (44834186).

81286774 is a wasteful number, since it uses less digits than its factorization.

81286774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715.

The product of its digits is 150528, while the sum is 43.

The square root of 81286774 is about 9015.9178124027. The cubic root of 81286774 is about 433.1848865621.

The spelling of 81286774 in words is "eighty-one million, two hundred eighty-six thousand, seven hundred seventy-four".