81740286 has 32 divisors (see below), whose sum is σ = 182138400. Its totient is φ = 27172800.

The previous prime is 81740249. The next prime is 81740287. The reversal of 81740286 is 68204718.

It is a self number, because there is not a number n which added to its sum of digits gives 81740286.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81740287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20236 + ... + 23936.

It is an arithmetic number, because the mean of its divisors is an integer number (5691825).

Almost surely, 2^81740286 is an apocalyptic number.

81740286 is an abundant number, since it is smaller than the sum of its proper divisors (100398114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81740286 is a wasteful number, since it uses less digits than its factorization.

81740286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4121 (or 4115 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 81740286 is about 9041.0334586263. The cubic root of 81740286 is about 433.9889957356.

The spelling of 81740286 in words is "eighty-one million, seven hundred forty thousand, two hundred eighty-six".