168639380 has 192 divisors, whose sum is σ = 466636800. Its totient is φ = 50803200.

The previous prime is 168639323. The next prime is 168639389. The reversal of 168639380 is 83936861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168639389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2764550 + ... + 2764610.

It is an arithmetic number, because the mean of its divisors is an integer number (2430400).

Almost surely, 2^168639380 is an apocalyptic number.

168639380 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 168639380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233318400).

168639380 is an abundant number, since it is smaller than the sum of its proper divisors (297997420).

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

168639380 is a wasteful number, since it uses less digits than its factorization.

168639380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 168639380 is about 12986.1225929836. The cubic root of 168639380 is about 552.4839494938.

The spelling of 168639380 in words is "one hundred sixty-eight million, six hundred thirty-nine thousand, three hundred eighty".