71115540 has 96 divisors (see below), whose sum is σ = 215066880. Its totient is φ = 17504256.

The previous prime is 71115521. The next prime is 71115547. The reversal of 71115540 is 4551117.

It is a super-3 number, since 3×71115540³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71115540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71115547) 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 31 ways as a sum of consecutive naturals, for example, 39132 + ... + 40908.

It is an arithmetic number, because the mean of its divisors is an integer number (2240280).

Almost surely, 2^71115540 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 71115540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107533440).

71115540 is an abundant number, since it is smaller than the sum of its proper divisors (143951340).

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

71115540 is a wasteful number, since it uses less digits than its factorization.

71115540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841 (or 1839 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 24.

The square root of 71115540 is about 8433.0030238344. The cubic root of 71115540 is about 414.3062682742.

Adding to 71115540 its reverse (4551117), we get a palindrome (75666657).

The spelling of 71115540 in words is "seventy-one million, one hundred fifteen thousand, five hundred forty".