721742772 has 24 divisors (see below), whose sum is σ = 1684841536. Its totient is φ = 240470208.

The previous prime is 721742743. The next prime is 721742809. The reversal of 721742772 is 277247127.

721742772 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 721742772.

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, 15873 + ... + 41175.

Almost surely, 2^721742772 is an apocalyptic number.

It is an amenable number.

721742772 is an abundant number, since it is smaller than the sum of its proper divisors (963098764).

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

721742772 is a wasteful number, since it uses less digits than its factorization.

721742772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27687 (or 27685 counting only the distinct ones).

The product of its digits is 76832, while the sum is 39.

The square root of 721742772 is about 26865.2707412377. The cubic root of 721742772 is about 897.0035209510.

Adding to 721742772 its reverse (277247127), we get a palindrome (998989899).

The spelling of 721742772 in words is "seven hundred twenty-one million, seven hundred forty-two thousand, seven hundred seventy-two".