722668 has 6 divisors (see below), whose sum is σ = 1264676. Its totient is φ = 361332.

The previous prime is 722663. The next prime is 722669. The reversal of 722668 is 866227.

It is a happy number.

722668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (722663) by changing a digit.

722668 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, 90330 + ... + 90337.

2⁷²²⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

722668 is a deficient number, since it is larger than the sum of its proper divisors (542008).

722668 is a wasteful number, since it uses less digits than its factorization.

722668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180671 (or 180669 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 722668 is about 850.0988177853. The cubic root of 722668 is about 89.7386657630.

The spelling of 722668 in words is "seven hundred twenty-two thousand, six hundred sixty-eight".