168387720 has 128 divisors (see below), whose sum is σ = 538876800. Its totient is φ = 41947136.

The previous prime is 168387677. The next prime is 168387727. The reversal of 168387720 is 27783861.

It is not an unprimeable number, because it can be changed into a prime (168387727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 401671 + ... + 402089.

It is an arithmetic number, because the mean of its divisors is an integer number (4209975).

Almost surely, 2^168387720 is an apocalyptic number.

168387720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168387720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269438400).

168387720 is an abundant number, since it is smaller than the sum of its proper divisors (370489080).

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

168387720 is a wasteful number, since it uses less digits than its factorization.

168387720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 168387720 is about 12976.4294010332. The cubic root of 168387720 is about 552.2089893389.

The spelling of 168387720 in words is "one hundred sixty-eight million, three hundred eighty-seven thousand, seven hundred twenty".