721311232 has 40 divisors (see below), whose sum is σ = 1452692736. Its totient is φ = 357783552.

The previous prime is 721311191. The next prime is 721311233. The reversal of 721311232 is 232113127.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721311233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59478 + ... + 70570.

Almost surely, 2^721311232 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 721311232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726346368).

721311232 is an abundant number, since it is smaller than the sum of its proper divisors (731381504).

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

721311232 is a wasteful number, since it uses less digits than its factorization.

721311232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11238 (or 11222 counting only the distinct ones).

The product of its digits is 504, while the sum is 22.

The square root of 721311232 is about 26857.2379815945. The cubic root of 721311232 is about 896.8247083650.

Adding to 721311232 its reverse (232113127), we get a palindrome (953424359).

The spelling of 721311232 in words is "seven hundred twenty-one million, three hundred eleven thousand, two hundred thirty-two".