317216728 has 16 divisors (see below), whose sum is σ = 595059480. Its totient is φ = 158534208.

The previous prime is 317216717. The next prime is 317216729. The reversal of 317216728 is 827612713.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317216729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11700 + ... + 27772.

Almost surely, 2^317216728 is an apocalyptic number.

It is an amenable number.

317216728 is a deficient number, since it is larger than the sum of its proper divisors (277842752).

317216728 is a wasteful number, since it uses less digits than its factorization.

317216728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18546 (or 18542 counting only the distinct ones).

The product of its digits is 28224, while the sum is 37.

The square root of 317216728 is about 17810.5791034430. The cubic root of 317216728 is about 682.0015479708.

It can be divided in two parts, 3172 and 16728, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 317216728 in words is "three hundred seventeen million, two hundred sixteen thousand, seven hundred twenty-eight".