71809132 has 12 divisors (see below), whose sum is σ = 132280120. Its totient is φ = 34014816.

The previous prime is 71809123. The next prime is 71809169. The reversal of 71809132 is 23190817.

It is a junction number, because it is equal to n+sod(n) for n = 71809094 and 71809103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472353 + ... + 472504.

Almost surely, 2^71809132 is an apocalyptic number.

It is an amenable number.

71809132 is a deficient number, since it is larger than the sum of its proper divisors (60470988).

71809132 is a wasteful number, since it uses less digits than its factorization.

71809132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944880 (or 944878 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 71809132 is about 8474.0269057869. The cubic root of 71809132 is about 415.6488268474.

Adding to 71809132 its reverse (23190817), we get a palindrome (94999949).

The spelling of 71809132 in words is "seventy-one million, eight hundred nine thousand, one hundred thirty-two".