720628 has 12 divisors (see below), whose sum is σ = 1267812. Its totient is φ = 358400.

The previous prime is 720619. The next prime is 720653. The reversal of 720628 is 826027.

It can be written as a sum of positive squares in 2 ways, for example, as 675684 + 44944 = 822^2 + 212^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678 + ... + 1378.

It is an arithmetic number, because the mean of its divisors is an integer number (105651).

2⁷²⁰⁶²⁸ is an apocalyptic number.

It is an amenable number.

720628 is a deficient number, since it is larger than the sum of its proper divisors (547184).

720628 is a wasteful number, since it uses less digits than its factorization.

720628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962 (or 960 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 720628 is about 848.8981093158. The cubic root of 720628 is about 89.6541458972.

The spelling of 720628 in words is "seven hundred twenty thousand, six hundred twenty-eight".