168918920 has 16 divisors (see below), whose sum is σ = 380067660. Its totient is φ = 67567552.

The previous prime is 168918917. The next prime is 168918973. The reversal of 168918920 is 29819861.

It can be written as a sum of positive squares in 2 ways, for example, as 164814244 + 4104676 = 12838^2 + 2026^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2111447 + ... + 2111526.

Almost surely, 2^168918920 is an apocalyptic number.

168918920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168918920 is an abundant number, since it is smaller than the sum of its proper divisors (211148740).

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

168918920 is a wasteful number, since it uses less digits than its factorization.

168918920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222984 (or 4222980 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 168918920 is about 12996.8811643409. The cubic root of 168918920 is about 552.7890504469.

The spelling of 168918920 in words is "one hundred sixty-eight million, nine hundred eighteen thousand, nine hundred twenty".