709728 has 24 divisors (see below), whose sum is σ = 1863288. Its totient is φ = 236544.

The previous prime is 709703. The next prime is 709729. The reversal of 709728 is 827907.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 709728.

It is not an unprimeable number, because it can be changed into a prime (709729) by changing a digit.

709728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3601 + ... + 3792.

It is an arithmetic number, because the mean of its divisors is an integer number (77637).

2⁷⁰⁹⁷²⁸ is an apocalyptic number.

It is an amenable number.

709728 is an abundant number, since it is smaller than the sum of its proper divisors (1153560).

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

709728 is a wasteful number, since it uses less digits than its factorization.

709728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7406 (or 7398 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 709728 is about 842.4535595509. The cubic root of 709728 is about 89.1998203593.

The spelling of 709728 in words is "seven hundred nine thousand, seven hundred twenty-eight".