71321500 has 48 divisors (see below), whose sum is σ = 158165280. Its totient is φ = 28089600.

The previous prime is 71321491. The next prime is 71321519. The reversal of 71321500 is 512317.

It is a congruent number.

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, 32436 + ... + 34564.

It is an arithmetic number, because the mean of its divisors is an integer number (3295110).

Almost surely, 2^71321500 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 71321500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79082640).

71321500 is an abundant number, since it is smaller than the sum of its proper divisors (86843780).

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

71321500 is a wasteful number, since it uses less digits than its factorization.

71321500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215 (or 2203 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 71321500 is about 8445.2057405371. The cubic root of 71321500 is about 414.7058446778.

Adding to 71321500 its reverse (512317), we get a palindrome (71833817).

The spelling of 71321500 in words is "seventy-one million, three hundred twenty-one thousand, five hundred".