720868 has 12 divisors (see below), whose sum is σ = 1335852. Its totient is φ = 339200.

The previous prime is 720857. The next prime is 720869. The reversal of 720868 is 868027.

It can be written as a sum of positive squares in 2 ways, for example, as 589824 + 131044 = 768^2 + 362^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (720869) 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, 5233 + ... + 5368.

It is an arithmetic number, because the mean of its divisors is an integer number (111321).

2⁷²⁰⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

720868 is a deficient number, since it is larger than the sum of its proper divisors (614984).

720868 is a wasteful number, since it uses less digits than its factorization.

720868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10622 (or 10620 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 720868 is about 849.0394572692. The cubic root of 720868 is about 89.6640976832.

The spelling of 720868 in words is "seven hundred twenty thousand, eight hundred sixty-eight".