71508140 has 48 divisors (see below), whose sum is σ = 167650560. Its totient is φ = 25394880.

The previous prime is 71508139. The next prime is 71508149. The reversal of 71508140 is 4180517.

It is a super-2 number, since 2×71508140² = 10226828172519200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71508149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5681 + ... + 13239.

It is an arithmetic number, because the mean of its divisors is an integer number (3492720).

Almost surely, 2^71508140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71508140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83825280).

71508140 is an abundant number, since it is smaller than the sum of its proper divisors (96142420).

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

71508140 is a wasteful number, since it uses less digits than its factorization.

71508140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7622 (or 7620 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 71508140 is about 8456.2485772357. The cubic root of 71508140 is about 415.0672751050.

Adding to 71508140 its reverse (4180517), we get a palindrome (75688657).

The spelling of 71508140 in words is "seventy-one million, five hundred eight thousand, one hundred forty".