722740 has 12 divisors (see below), whose sum is σ = 1517796. Its totient is φ = 289088.

The previous prime is 722737. The next prime is 722749. The reversal of 722740 is 47227.

It can be written as a sum of positive squares in 2 ways, for example, as 345744 + 376996 = 588^2 + 614^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18049 + ... + 18088.

It is an arithmetic number, because the mean of its divisors is an integer number (126483).

2⁷²²⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

722740 is an abundant number, since it is smaller than the sum of its proper divisors (795056).

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

722740 is a wasteful number, since it uses less digits than its factorization.

722740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36146 (or 36144 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 722740 is about 850.1411647485. The cubic root of 722740 is about 89.7416459094.

Adding to 722740 its reverse (47227), we get a palindrome (769967).

The spelling of 722740 in words is "seven hundred twenty-two thousand, seven hundred forty", and thus it is an iban number.