168820140 has 24 divisors (see below), whose sum is σ = 472696560. Its totient is φ = 45018688.

The previous prime is 168820139. The next prime is 168820163. The reversal of 168820140 is 41028861.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 168820098 and 168820107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1406775 + ... + 1406894.

It is an arithmetic number, because the mean of its divisors is an integer number (19695690).

Almost surely, 2^168820140 is an apocalyptic number.

168820140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168820140 is an abundant number, since it is smaller than the sum of its proper divisors (303876420).

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

168820140 is a wasteful number, since it uses less digits than its factorization.

168820140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813681 (or 2813679 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 168820140 is about 12993.0804661558. The cubic root of 168820140 is about 552.6812765522.

The spelling of 168820140 in words is "one hundred sixty-eight million, eight hundred twenty thousand, one hundred forty".