71722240 has 72 divisors (see below), whose sum is σ = 173474280. Its totient is φ = 28409856.

The previous prime is 71722177. The next prime is 71722247. The reversal of 71722240 is 4222717.

It can be written as a sum of positive squares in 4 ways, for example, as 23503104 + 48219136 = 4848^2 + 6944^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71722247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175156 + ... + 175564.

It is an arithmetic number, because the mean of its divisors is an integer number (2409365).

Almost surely, 2^71722240 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 71722240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86737140).

71722240 is an abundant number, since it is smaller than the sum of its proper divisors (101752040).

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

71722240 is a wasteful number, since it uses less digits than its factorization.

71722240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 553 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 71722240 is about 8468.8983935338. The cubic root of 71722240 is about 415.4811084614.

Adding to 71722240 its reverse (4222717), we get a palindrome (75944957).

The spelling of 71722240 in words is "seventy-one million, seven hundred twenty-two thousand, two hundred forty".