721272 has 32 divisors (see below), whose sum is σ = 1849680. Its totient is φ = 234240.

The previous prime is 721267. The next prime is 721283. The reversal of 721272 is 272127.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618 + ... + 1350.

2⁷²¹²⁷² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (924840).

721272 is an abundant number, since it is smaller than the sum of its proper divisors (1128408).

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

721272 is a wasteful number, since it uses less digits than its factorization.

721272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783 (or 779 counting only the distinct ones).

The product of its digits is 392, while the sum is 21.

The square root of 721272 is about 849.2773398602. The cubic root of 721272 is about 89.6808448687.

Adding to 721272 its reverse (272127), we get a palindrome (993399).

The spelling of 721272 in words is "seven hundred twenty-one thousand, two hundred seventy-two", and thus it is an iban number.