717920 has 48 divisors (see below), whose sum is σ = 1941408. Its totient is φ = 245760.

The previous prime is 717919. The next prime is 717923. The reversal of 717920 is 29717.

It is a self number, because there is not a number n which added to its sum of digits gives 717920.

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 717920.

It is not an unprimeable number, because it can be changed into a prime (717923) 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, 800 + ... + 1440.

It is an arithmetic number, because the mean of its divisors is an integer number (40446).

2⁷¹⁷⁹²⁰ is an apocalyptic number.

717920 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 717920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (970704).

717920 is an abundant number, since it is smaller than the sum of its proper divisors (1223488).

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

717920 is a wasteful number, since it uses less digits than its factorization.

717920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 717920 is about 847.3015991959. The cubic root of 717920 is about 89.5417031497.

The spelling of 717920 in words is "seven hundred seventeen thousand, nine hundred twenty".