71315580 has 144 divisors (see below), whose sum is σ = 235339776. Its totient is φ = 16087680.

The previous prime is 71315557. The next prime is 71315599. The reversal of 71315580 is 8551317.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 373285 + ... + 373475.

It is an arithmetic number, because the mean of its divisors is an integer number (1634304).

Almost surely, 2^71315580 is an apocalyptic number.

71315580 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71315580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117669888).

71315580 is an abundant number, since it is smaller than the sum of its proper divisors (164024196).

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

71315580 is a wasteful number, since it uses less digits than its factorization.

71315580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 71315580 is about 8444.8552385461. The cubic root of 71315580 is about 414.6943702204.

Adding to 71315580 its reverse (8551317), we get a palindrome (79866897).

The spelling of 71315580 in words is "seventy-one million, three hundred fifteen thousand, five hundred eighty".