717728128 has 48 divisors (see below), whose sum is σ = 1548344700. Its totient is φ = 331249152.

The previous prime is 717728113. The next prime is 717728159. The reversal of 717728128 is 821827717.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5043 + ... + 38221.

Almost surely, 2^717728128 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 717728128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (774172350).

717728128 is an abundant number, since it is smaller than the sum of its proper divisors (830616572).

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

717728128 is a wasteful number, since it uses less digits than its factorization.

717728128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33219 (or 33194 counting only the distinct ones).

The product of its digits is 87808, while the sum is 43.

The square root of 717728128 is about 26790.4484471612. The cubic root of 717728128 is about 895.3372543796.

The spelling of 717728128 in words is "seven hundred seventeen million, seven hundred twenty-eight thousand, one hundred twenty-eight".