722131440 has 160 divisors (see below), whose sum is σ = 2381633280. Its totient is φ = 180375552.

The previous prime is 722131439. The next prime is 722131441. The reversal of 722131440 is 44131227.

It is a happy number.

722131440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (722131439) and next prime (722131441).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 722131440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722131441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1546087 + ... + 1546553.

It is an arithmetic number, because the mean of its divisors is an integer number (14885208).

Almost surely, 2^722131440 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 722131440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1190816640).

722131440 is an abundant number, since it is smaller than the sum of its proper divisors (1659501840).

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

722131440 is a wasteful number, since it uses less digits than its factorization.

722131440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879 (or 873 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 722131440 is about 26872.5034189225. The cubic root of 722131440 is about 897.1645081314.

Adding to 722131440 its reverse (44131227), we get a palindrome (766262667).

The spelling of 722131440 in words is "seven hundred twenty-two million, one hundred thirty-one thousand, four hundred forty".