71317240 has 16 divisors (see below), whose sum is σ = 160463880. Its totient is φ = 28526880.

The previous prime is 71317219. The next prime is 71317247. The reversal of 71317240 is 4271317.

It is a happy number.

It is a super-2 number, since 2×71317240² = 10172297442435200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71317247) 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, 891426 + ... + 891505.

Almost surely, 2^71317240 is an apocalyptic number.

It is an amenable number.

71317240 is an abundant number, since it is smaller than the sum of its proper divisors (89146640).

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

71317240 is a wasteful number, since it uses less digits than its factorization.

71317240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782942 (or 1782938 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 71317240 is about 8444.9535226667. The cubic root of 71317240 is about 414.6975877844.

Adding to 71317240 its reverse (4271317), we get a palindrome (75588557).

The spelling of 71317240 in words is "seventy-one million, three hundred seventeen thousand, two hundred forty".