721472 has 14 divisors (see below), whose sum is σ = 1431798. Its totient is φ = 360704.

The previous prime is 721451. The next prime is 721481. The reversal of 721472 is 274127.

It can be written as a sum of positive squares in only one way, i.e., 541696 + 179776 = 736^2 + 424^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5573 + ... + 5700.

2⁷²¹⁴⁷² is an apocalyptic number.

It is an amenable number.

721472 is a deficient number, since it is larger than the sum of its proper divisors (710326).

721472 is a wasteful number, since it uses less digits than its factorization.

721472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11285 (or 11275 counting only the distinct ones).

The product of its digits is 784, while the sum is 23.

The square root of 721472 is about 849.3950788650. The cubic root of 721472 is about 89.6891332405.

Adding to 721472 its reverse (274127), we get a palindrome (995599).

The spelling of 721472 in words is "seven hundred twenty-one thousand, four hundred seventy-two", and thus it is an iban number.