722506 has 8 divisors (see below), whose sum is σ = 1121220. Its totient is φ = 348768.

The previous prime is 722489. The next prime is 722509. The reversal of 722506 is 605227.

It can be written as a sum of positive squares in 2 ways, for example, as 697225 + 25281 = 835^2 + 159^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (722509) 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, 6171 + ... + 6286.

2⁷²²⁵⁰⁶ is an apocalyptic number.

722506 is a deficient number, since it is larger than the sum of its proper divisors (398714).

722506 is a wasteful number, since it uses less digits than its factorization.

722506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12488.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 722506 is about 850.0035294044. The cubic root of 722506 is about 89.7319597097.

The spelling of 722506 in words is "seven hundred twenty-two thousand, five hundred six".