747728 has 20 divisors (see below), whose sum is σ = 1534500. Its totient is φ = 351744.

The previous prime is 747713. The next prime is 747731. The reversal of 747728 is 827747.

It can be written as a sum of positive squares in 2 ways, for example, as 322624 + 425104 = 568^2 + 652^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103 + ... + 1646.

It is an arithmetic number, because the mean of its divisors is an integer number (76725).

2⁷⁴⁷⁷²⁸ is an apocalyptic number.

It is an amenable number.

747728 is an abundant number, since it is smaller than the sum of its proper divisors (786772).

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

747728 is a wasteful number, since it uses less digits than its factorization.

747728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774 (or 2768 counting only the distinct ones).

The product of its digits is 21952, while the sum is 35.

The square root of 747728 is about 864.7126690410. The cubic root of 747728 is about 90.7641924442.

The spelling of 747728 in words is "seven hundred forty-seven thousand, seven hundred twenty-eight".