71804161 has 32 divisors (see below), whose sum is σ = 89018496. Its totient is φ = 57024000.

The previous prime is 71804147. The next prime is 71804167. The reversal of 71804161 is 16140817.

It is a de Polignac number, because none of the positive numbers 2^k-71804161 is a prime.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71804167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216766 + ... + 217096.

It is an arithmetic number, because the mean of its divisors is an integer number (2781828).

It is a Poulet number, since it divides 2^71804160-1.

Almost surely, 2^71804161 is an apocalyptic number.

It is an amenable number.

71804161 is a deficient number, since it is larger than the sum of its proper divisors (17214335).

71804161 is a wasteful number, since it uses less digits than its factorization.

71804161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 71804161 is about 8473.7335926969. The cubic root of 71804161 is about 415.6392355047.

Adding to 71804161 its reverse (16140817), we get a palindrome (87944978).

The spelling of 71804161 in words is "seventy-one million, eight hundred four thousand, one hundred sixty-one".