71315380 has 24 divisors (see below), whose sum is σ = 149937480. Its totient is φ = 28492800.

The previous prime is 71315351. The next prime is 71315383. The reversal of 71315380 is 8351317.

It can be written as a sum of positive squares in 4 ways, for example, as 11035684 + 60279696 = 3322^2 + 7764^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71315383) 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 7 ways as a sum of consecutive naturals, for example, 22536 + ... + 25504.

It is an arithmetic number, because the mean of its divisors is an integer number (6247395).

Almost surely, 2^71315380 is an apocalyptic number.

It is an amenable number.

71315380 is an abundant number, since it is smaller than the sum of its proper divisors (78622100).

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

71315380 is a wasteful number, since it uses less digits than its factorization.

71315380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4179 (or 4177 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 71315380 is about 8444.8433970086. The cubic root of 71315380 is about 414.6939825588.

Adding to 71315380 its reverse (8351317), we get a palindrome (79666697).

The spelling of 71315380 in words is "seventy-one million, three hundred fifteen thousand, three hundred eighty".