81851862 has 16 divisors (see below), whose sum is σ = 169349040. Its totient is φ = 26343072.

The previous prime is 81851857. The next prime is 81851893. The reversal of 81851862 is 26815818.

It is a self number, because there is not a number n which added to its sum of digits gives 81851862.

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, 235033 + ... + 235380.

It is an arithmetic number, because the mean of its divisors is an integer number (10584315).

Almost surely, 2^81851862 is an apocalyptic number.

81851862 is an abundant number, since it is smaller than the sum of its proper divisors (87497178).

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

81851862 is a wasteful number, since it uses less digits than its factorization.

81851862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470447.

The product of its digits is 30720, while the sum is 39.

The square root of 81851862 is about 9047.2018878767. The cubic root of 81851862 is about 434.1863718513.

The spelling of 81851862 in words is "eighty-one million, eight hundred fifty-one thousand, eight hundred sixty-two".