744747728 has 40 divisors (see below), whose sum is σ = 1522670400. Its totient is φ = 352166144.

The previous prime is 744747727. The next prime is 744747767. The reversal of 744747728 is 827747447.

744747728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×744747728² = 1109298356722323968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744747727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21383 + ... + 44121.

It is an arithmetic number, because the mean of its divisors is an integer number (38066760).

Almost surely, 2^744747728 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 744747728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (761335200).

744747728 is an abundant number, since it is smaller than the sum of its proper divisors (777922672).

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

744747728 is a wasteful number, since it uses less digits than its factorization.

744747728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22859 (or 22853 counting only the distinct ones).

The product of its digits is 2458624, while the sum is 50.

The square root of 744747728 is about 27290.0664711539. The cubic root of 744747728 is about 906.4344347065.

The spelling of 744747728 in words is "seven hundred forty-four million, seven hundred forty-seven thousand, seven hundred twenty-eight".