168421878 has 12 divisors (see below), whose sum is σ = 364914108. Its totient is φ = 56140620.

The previous prime is 168421837. The next prime is 168421889. The reversal of 168421878 is 878124861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4678368 + ... + 4678403.

It is an arithmetic number, because the mean of its divisors is an integer number (30409509).

Almost surely, 2^168421878 is an apocalyptic number.

168421878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

168421878 is an abundant number, since it is smaller than the sum of its proper divisors (196492230).

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

168421878 is a wasteful number, since it uses less digits than its factorization.

168421878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9356779 (or 9356776 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 168421878 is about 12977.7454898761. The cubic root of 168421878 is about 552.2463259478.

The spelling of 168421878 in words is "one hundred sixty-eight million, four hundred twenty-one thousand, eight hundred seventy-eight".