722628 has 24 divisors (see below), whose sum is σ = 1873760. Its totient is φ = 240840.

The previous prime is 722611. The next prime is 722633. The reversal of 722628 is 826227.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

722628 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 in 7 ways as a sum of consecutive naturals, for example, 3238 + ... + 3453.

2⁷²²⁶²⁸ is an apocalyptic number.

It is an amenable number.

722628 is an abundant number, since it is smaller than the sum of its proper divisors (1151132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

722628 is a wasteful number, since it uses less digits than its factorization.

722628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6704 (or 6696 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 722628 is about 850.0752907831. The cubic root of 722628 is about 89.7370100405.

The spelling of 722628 in words is "seven hundred twenty-two thousand, six hundred twenty-eight".