717668644 has 48 divisors (see below), whose sum is σ = 1580261760. Its totient is φ = 277032960.

The previous prime is 717668629. The next prime is 717668683. The reversal of 717668644 is 446866717.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22884 + ... + 44260.

It is an arithmetic number, because the mean of its divisors is an integer number (32922120).

Almost surely, 2^717668644 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 717668644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790130880).

717668644 is an abundant number, since it is smaller than the sum of its proper divisors (862593116).

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

717668644 is a wasteful number, since it uses less digits than its factorization.

717668644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21508 (or 21506 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 49.

The square root of 717668644 is about 26789.3382523720. The cubic root of 717668644 is about 895.3125190560.

The spelling of 717668644 in words is "seven hundred seventeen million, six hundred sixty-eight thousand, six hundred forty-four".