722626 has 4 divisors (see below), whose sum is σ = 1083942. Its totient is φ = 361312.

The previous prime is 722611. The next prime is 722633. The reversal of 722626 is 626227.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 632025 + 90601 = 795^2 + 301^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 722626.

It is an unprimeable number.

722626 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 as a sum of consecutive naturals, namely, 180655 + ... + 180658.

2⁷²²⁶²⁶ is an apocalyptic number.

722626 is a deficient number, since it is larger than the sum of its proper divisors (361316).

722626 is a wasteful number, since it uses less digits than its factorization.

722626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361315.

The product of its digits is 2016, while the sum is 25.

The square root of 722626 is about 850.0741144159. The cubic root of 722626 is about 89.7369272528.

The spelling of 722626 in words is "seven hundred twenty-two thousand, six hundred twenty-six".