168561380 has 96 divisors (see below), whose sum is σ = 394740864. Its totient is φ = 60079104.

The previous prime is 168561377. The next prime is 168561389. The reversal of 168561380 is 83165861.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (168561389) 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, 1575287 + ... + 1575393.

It is an arithmetic number, because the mean of its divisors is an integer number (4111884).

Almost surely, 2^168561380 is an apocalyptic number.

168561380 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 168561380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197370432).

168561380 is an abundant number, since it is smaller than the sum of its proper divisors (226179484).

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

168561380 is a wasteful number, since it uses less digits than its factorization.

168561380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 168561380 is about 12983.1190397377. The cubic root of 168561380 is about 552.3987570677.

The spelling of 168561380 in words is "one hundred sixty-eight million, five hundred sixty-one thousand, three hundred eighty".