71216440 has 16 divisors (see below), whose sum is σ = 160237080. Its totient is φ = 28486560.

The previous prime is 71216437. The next prime is 71216449. The reversal of 71216440 is 4461217.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71216449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 890166 + ... + 890245.

Almost surely, 2^71216440 is an apocalyptic number.

It is an amenable number.

71216440 is an abundant number, since it is smaller than the sum of its proper divisors (89020640).

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

71216440 is a wasteful number, since it uses less digits than its factorization.

71216440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780422 (or 1780418 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 71216440 is about 8438.9833510915. The cubic root of 71216440 is about 414.5021173929.

Adding to 71216440 its reverse (4461217), we get a palindrome (75677657).

The spelling of 71216440 in words is "seventy-one million, two hundred sixteen thousand, four hundred forty".