722920 has 64 divisors (see below), whose sum is σ = 1866240. Its totient is φ = 249600.

The previous prime is 722903. The next prime is 722921. The reversal of 722920 is 29227.

722920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×722920² = 1045226652800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 722891 and 722900.

It is not an unprimeable number, because it can be changed into a prime (722921) by changing a digit.

722920 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13614 + ... + 13666.

It is an arithmetic number, because the mean of its divisors is an integer number (29160).

2⁷²²⁹²⁰ 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 722920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933120).

722920 is an abundant number, since it is smaller than the sum of its proper divisors (1143320).

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

722920 is a wasteful number, since it uses less digits than its factorization.

722920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 722920 is about 850.2470229292. The cubic root of 722920 is about 89.7490954097.

It can be divided in two parts, 72 and 2920, that added together give a palindrome (2992).

The spelling of 722920 in words is "seven hundred twenty-two thousand, nine hundred twenty".