168893820 has 72 divisors (see below), whose sum is σ = 513371040. Its totient is φ = 44945280.

The previous prime is 168893783. The next prime is 168893821. The reversal of 168893820 is 28398861.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168893821) 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 23 ways as a sum of consecutive naturals, for example, 164910 + ... + 165930.

Almost surely, 2^168893820 is an apocalyptic number.

168893820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168893820 is an abundant number, since it is smaller than the sum of its proper divisors (344477220).

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

168893820 is a wasteful number, since it uses less digits than its factorization.

168893820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955 (or 1950 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 168893820 is about 12995.9155121907. The cubic root of 168893820 is about 552.7616690806.

The spelling of 168893820 in words is "one hundred sixty-eight million, eight hundred ninety-three thousand, eight hundred twenty".