721268 has 6 divisors (see below), whose sum is σ = 1262226. Its totient is φ = 360632.

The previous prime is 721267. The next prime is 721283. The reversal of 721268 is 862127.

It can be written as a sum of positive squares in only one way, i.e., 438244 + 283024 = 662^2 + 532^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721268.

It is not an unprimeable number, because it can be changed into a prime (721261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90155 + ... + 90162.

It is an arithmetic number, because the mean of its divisors is an integer number (210371).

2⁷²¹²⁶⁸ is an apocalyptic number.

It is an amenable number.

721268 is a deficient number, since it is larger than the sum of its proper divisors (540958).

721268 is a wasteful number, since it uses less digits than its factorization.

721268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180321 (or 180319 counting only the distinct ones).

The product of its digits is 1344, while the sum is 26.

The square root of 721268 is about 849.2749849136. The cubic root of 721268 is about 89.6806790857.

It can be divided in two parts, 721 and 268, that added together give a palindrome (989).

The spelling of 721268 in words is "seven hundred twenty-one thousand, two hundred sixty-eight".