71308440 has 96 divisors (see below), whose sum is σ = 264869280. Its totient is φ = 16298496.

The previous prime is 71308427. The next prime is 71308459. The reversal of 71308440 is 4480317.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11629 + ... + 16668.

It is an arithmetic number, because the mean of its divisors is an integer number (2759055).

Almost surely, 2^71308440 is an apocalyptic number.

71308440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71308440 is an abundant number, since it is smaller than the sum of its proper divisors (193560840).

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

71308440 is a wasteful number, since it uses less digits than its factorization.

71308440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28321 (or 28314 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 71308440 is about 8444.4324853716. The cubic root of 71308440 is about 414.6805302497.

Adding to 71308440 its reverse (4480317), we get a palindrome (75788757).

The spelling of 71308440 in words is "seventy-one million, three hundred eight thousand, four hundred forty".