168568938 has 80 divisors (see below), whose sum is σ = 398704680. Its totient is φ = 53149824.

The previous prime is 168568919. The next prime is 168568949. The reversal of 168568938 is 839865861.

It can be written as a sum of positive squares in 4 ways, for example, as 167262489 + 1306449 = 12933^2 + 1143^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 248656 + ... + 249332.

Almost surely, 2^168568938 is an apocalyptic number.

168568938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 168568938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199352340).

168568938 is an abundant number, since it is smaller than the sum of its proper divisors (230135742).

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

168568938 is a wasteful number, since it uses less digits than its factorization.

168568938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 764 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 168568938 is about 12983.4101067478. The cubic root of 168568938 is about 552.4070131451.

The spelling of 168568938 in words is "one hundred sixty-eight million, five hundred sixty-eight thousand, nine hundred thirty-eight".