71305580 has 48 divisors (see below), whose sum is σ = 157925376. Its totient is φ = 27003840.

The previous prime is 71305579. The next prime is 71305607. The reversal of 71305580 is 8550317.

It is a super-3 number, since 3×71305580³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27917 + ... + 30363.

It is an arithmetic number, because the mean of its divisors is an integer number (3290112).

Almost surely, 2^71305580 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 71305580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78962688).

71305580 is an abundant number, since it is smaller than the sum of its proper divisors (86619796).

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

71305580 is a wasteful number, since it uses less digits than its factorization.

71305580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534 (or 2532 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 71305580 is about 8444.2631413286. The cubic root of 71305580 is about 414.6749862488.

Adding to 71305580 its reverse (8550317), we get a palindrome (79855897).

The spelling of 71305580 in words is "seventy-one million, three hundred five thousand, five hundred eighty".