71804 has 12 divisors (see below), whose sum is σ = 130200. Its totient is φ = 34608.

The previous prime is 71789. The next prime is 71807. The reversal of 71804 is 40817.

It is a happy number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71807) by changing a digit.

71804 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, 194 + ... + 425.

It is an arithmetic number, because the mean of its divisors is an integer number (10850).

2⁷¹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

71804 is a deficient number, since it is larger than the sum of its proper divisors (58396).

71804 is a wasteful number, since it uses less digits than its factorization.

71804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 71804 is about 267.9626839692. The cubic root of 71804 is about 41.5638924854.

Adding to 71804 its sum of digits (20), we get a square (71824 = 268²).

The spelling of 71804 in words is "seventy-one thousand, eight hundred four".