722240 has 56 divisors (see below), whose sum is σ = 1795272. Its totient is φ = 276480.

The previous prime is 722237. The next prime is 722243. The reversal of 722240 is 42227.

It is an interprime number because it is at equal distance from previous prime (722237) and next prime (722243).

It can be written as a sum of positive squares in 4 ways, for example, as 43264 + 678976 = 208^2 + 824^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722243) 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, 11810 + ... + 11870.

2⁷²²²⁴⁰ 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 722240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (897636).

722240 is an abundant number, since it is smaller than the sum of its proper divisors (1073032).

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

722240 is a wasteful number, since it uses less digits than its factorization.

722240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 722240 is about 849.8470450616. The cubic root of 722240 is about 89.7209463612.

Adding to 722240 its reverse (42227), we get a palindrome (764467).

The spelling of 722240 in words is "seven hundred twenty-two thousand, two hundred forty", and thus it is an iban number.