722636 has 12 divisors (see below), whose sum is σ = 1339128. Its totient is φ = 340032.

The previous prime is 722633. The next prime is 722639. The reversal of 722636 is 636227.

It is an interprime number because it is at equal distance from previous prime (722633) and next prime (722639).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (722633) 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, 5246 + ... + 5381.

It is an arithmetic number, because the mean of its divisors is an integer number (111594).

2⁷²²⁶³⁶ is an apocalyptic number.

It is an amenable number.

722636 is a deficient number, since it is larger than the sum of its proper divisors (616492).

722636 is a wasteful number, since it uses less digits than its factorization.

722636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10648 (or 10646 counting only the distinct ones).

The product of its digits is 3024, while the sum is 26.

The square root of 722636 is about 850.0799962356. The cubic root of 722636 is about 89.7373411899.

The spelling of 722636 in words is "seven hundred twenty-two thousand, six hundred thirty-six".