71302540 has 12 divisors (see below), whose sum is σ = 149735376. Its totient is φ = 28521008.

The previous prime is 71302537. The next prime is 71302541. The reversal of 71302540 is 4520317.

It is not an unprimeable number, because it can be changed into a prime (71302541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1782544 + ... + 1782583.

It is an arithmetic number, because the mean of its divisors is an integer number (12477948).

Almost surely, 2^71302540 is an apocalyptic number.

It is an amenable number.

71302540 is an abundant number, since it is smaller than the sum of its proper divisors (78432836).

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

71302540 is a wasteful number, since it uses less digits than its factorization.

71302540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3565136 (or 3565134 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 71302540 is about 8444.0831355453. The cubic root of 71302540 is about 414.6690931622.

Adding to 71302540 its reverse (4520317), we get a palindrome (75822857).

The spelling of 71302540 in words is "seventy-one million, three hundred two thousand, five hundred forty".