71818 has 8 divisors (see below), whose sum is σ = 108900. Its totient is φ = 35520.

The previous prime is 71809. The next prime is 71821. The reversal of 71818 is 81817.

It can be written as a sum of positive squares in 2 ways, for example, as 71289 + 529 = 267^2 + 23^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 12 and base 16.

It is a junction number, because it is equal to n+sod(n) for n = 71792 and 71801.

It is an unprimeable number.

71818 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178 + ... + 418.

2⁷¹⁸¹⁸ is an apocalyptic number.

71818 is a deficient number, since it is larger than the sum of its proper divisors (37082).

71818 is a wasteful number, since it uses less digits than its factorization.

71818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392.

The product of its digits is 448, while the sum is 25.

The square root of 71818 is about 267.9888057364. The cubic root of 71818 is about 41.5665936194.

Subtracting 71818 from its reverse (81817), we obtain a palindrome (9999).

The spelling of 71818 in words is "seventy-one thousand, eight hundred eighteen".