71215140 has 48 divisors (see below), whose sum is σ = 200204928. Its totient is φ = 18914304.

The previous prime is 71215139. The next prime is 71215163. The reversal of 71215140 is 4151217.

It is a happy number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13524 + ... + 18036.

It is an arithmetic number, because the mean of its divisors is an integer number (4170936).

Almost surely, 2^71215140 is an apocalyptic number.

It is an amenable number.

71215140 is an abundant number, since it is smaller than the sum of its proper divisors (128989788).

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

71215140 is a wasteful number, since it uses less digits than its factorization.

71215140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4788 (or 4786 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 71215140 is about 8438.9063272441. The cubic root of 71215140 is about 414.4995952411.

Adding to 71215140 its reverse (4151217), we get a palindrome (75366357).

The spelling of 71215140 in words is "seventy-one million, two hundred fifteen thousand, one hundred forty".