721572 has 24 divisors (see below), whose sum is σ = 1698816. Its totient is φ = 238368.

The previous prime is 721571. The next prime is 721577. The reversal of 721572 is 275127.

It is not an unprimeable number, because it can be changed into a prime (721571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1693 + ... + 2075.

It is an arithmetic number, because the mean of its divisors is an integer number (70784).

2⁷²¹⁵⁷² is an apocalyptic number.

It is an amenable number.

721572 is an abundant number, since it is smaller than the sum of its proper divisors (977244).

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

721572 is a wasteful number, since it uses less digits than its factorization.

721572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 545 counting only the distinct ones).

The product of its digits is 980, while the sum is 24.

The square root of 721572 is about 849.4539422476. The cubic root of 721572 is about 89.6932768519.

Adding to 721572 its reverse (275127), we get a palindrome (996699).

The spelling of 721572 in words is "seven hundred twenty-one thousand, five hundred seventy-two".