717172428 has 72 divisors (see below), whose sum is σ = 1971379200. Its totient is φ = 202299552.

The previous prime is 717172427. The next prime is 717172433. The reversal of 717172428 is 824271717.

It is not an unprimeable number, because it can be changed into a prime (717172427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38733 + ... + 54171.

Almost surely, 2^717172428 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 717172428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985689600).

717172428 is an abundant number, since it is smaller than the sum of its proper divisors (1254206772).

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

717172428 is a wasteful number, since it uses less digits than its factorization.

717172428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15539 (or 15530 counting only the distinct ones).

The product of its digits is 43904, while the sum is 39.

The square root of 717172428 is about 26780.0752052715. The cubic root of 717172428 is about 895.1061235125.

The spelling of 717172428 in words is "seven hundred seventeen million, one hundred seventy-two thousand, four hundred twenty-eight".