721231472 has 40 divisors (see below), whose sum is σ = 1520433936. Its totient is φ = 329435136.

The previous prime is 721231453. The next prime is 721231481. The reversal of 721231472 is 274132127.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2303 + ... + 38049.

Almost surely, 2^721231472 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 721231472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (760216968).

721231472 is an abundant number, since it is smaller than the sum of its proper divisors (799202464).

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

721231472 is a wasteful number, since it uses less digits than its factorization.

721231472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35865 (or 35859 counting only the distinct ones).

The product of its digits is 4704, while the sum is 29.

The square root of 721231472 is about 26855.7530521860. The cubic root of 721231472 is about 896.7916512637.

Adding to 721231472 its reverse (274132127), we get a palindrome (995363599).

The spelling of 721231472 in words is "seven hundred twenty-one million, two hundred thirty-one thousand, four hundred seventy-two".