71812 has 12 divisors (see below), whose sum is σ = 135436. Its totient is φ = 33120.

The previous prime is 71809. The next prime is 71821. The reversal of 71812 is 21817.

It can be written as a sum of positive squares in 2 ways, for example, as 20736 + 51076 = 144^2 + 226^2 .

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 71812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639 + ... + 742.

2⁷¹⁸¹² is an apocalyptic number.

It is an amenable number.

71812 is a deficient number, since it is larger than the sum of its proper divisors (63624).

71812 is a wasteful number, since it uses less digits than its factorization.

71812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398 (or 1396 counting only the distinct ones).

The product of its digits is 112, while the sum is 19.

The square root of 71812 is about 267.9776110051. The cubic root of 71812 is about 41.5654360336.

The spelling of 71812 in words is "seventy-one thousand, eight hundred twelve".