71217320 has 64 divisors (see below), whose sum is σ = 170856000. Its totient is φ = 26638848.

The previous prime is 71217313. The next prime is 71217329. The reversal of 71217320 is 2371217.

It is not an unprimeable number, because it can be changed into a prime (71217329) 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, 62516 + ... + 63644.

It is an arithmetic number, because the mean of its divisors is an integer number (2669625).

Almost surely, 2^71217320 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 71217320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85428000).

71217320 is an abundant number, since it is smaller than the sum of its proper divisors (99638680).

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

71217320 is a wasteful number, since it uses less digits than its factorization.

71217320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 71217320 is about 8439.0354899123. The cubic root of 71217320 is about 414.5038246783.

Adding to 71217320 its reverse (2371217), we get a palindrome (73588537).

It can be divided in two parts, 7121 and 7320, that added together give a palindrome (14441).

The spelling of 71217320 in words is "seventy-one million, two hundred seventeen thousand, three hundred twenty".