71330172 has 12 divisors (see below), whose sum is σ = 166437096. Its totient is φ = 23776720.

The previous prime is 71330137. The next prime is 71330173. The reversal of 71330172 is 27103317.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71330173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2972079 + ... + 2972102.

It is an arithmetic number, because the mean of its divisors is an integer number (13869758).

Almost surely, 2^71330172 is an apocalyptic number.

It is an amenable number.

71330172 is an abundant number, since it is smaller than the sum of its proper divisors (95106924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71330172 is a wasteful number, since it uses less digits than its factorization.

71330172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5944188 (or 5944186 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 71330172 is about 8445.7191523280. The cubic root of 71330172 is about 414.7226520610.

Adding to 71330172 its reverse (27103317), we get a palindrome (98433489).

The spelling of 71330172 in words is "seventy-one million, three hundred thirty thousand, one hundred seventy-two".