722420 has 24 divisors (see below), whose sum is σ = 1555848. Its totient is φ = 281600.

The previous prime is 722417. The next prime is 722431. The reversal of 722420 is 24227.

722420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13456 + 708964 = 116^2 + 842^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380 + ... + 1260.

It is an arithmetic number, because the mean of its divisors is an integer number (64827).

2⁷²²⁴²⁰ 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 722420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777924).

722420 is an abundant number, since it is smaller than the sum of its proper divisors (833428).

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

722420 is a wasteful number, since it uses less digits than its factorization.

722420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931 (or 929 counting only the distinct ones).

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

The square root of 722420 is about 849.9529398737. The cubic root of 722420 is about 89.7283992988.

Adding to 722420 its reverse (24227), we get a palindrome (746647).

The spelling of 722420 in words is "seven hundred twenty-two thousand, four hundred twenty", and thus it is an iban number.