722866 has 4 divisors (see below), whose sum is σ = 1084302. Its totient is φ = 361432.

The previous prime is 722849. The next prime is 722881. The reversal of 722866 is 668227.

It is a happy number.

722866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668227 = 7 ⋅95461.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 137641 = 765^2 + 371^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180715 + ... + 180718.

2⁷²²⁸⁶⁶ is an apocalyptic number.

722866 is a deficient number, since it is larger than the sum of its proper divisors (361436).

722866 is a wasteful number, since it uses less digits than its factorization.

722866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361435.

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

The square root of 722866 is about 850.2152668589. The cubic root of 722866 is about 89.7468606894.

The spelling of 722866 in words is "seven hundred twenty-two thousand, eight hundred sixty-six".