717983380920 has 128 divisors (see below), whose sum is σ = 2320366809600. Its totient is φ = 176678889984.

The previous prime is 717983380897. The next prime is 717983380931. The reversal of 717983380920 is 29083389717.

It is a Cunningham number, because it is equal to 847339²-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5013429 + ... + 5154651.

It is an arithmetic number, because the mean of its divisors is an integer number (18127865700).

Almost surely, 2^717983380920 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 717983380920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1160183404800).

717983380920 is an abundant number, since it is smaller than the sum of its proper divisors (1602383428680).

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

717983380920 is a wasteful number, since it uses less digits than its factorization.

717983380920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144509 (or 144505 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 57.

It can be divided in two parts, 717983 and 380920, that added together give a triangular number (1098903 = T₁₄₈₂).

The spelling of 717983380920 in words is "seven hundred seventeen billion, nine hundred eighty-three million, three hundred eighty thousand, nine hundred twenty".