163812220 has 144 divisors (see below), whose sum is σ = 420424704. Its totient is φ = 53222400.

The previous prime is 163812217. The next prime is 163812227. The reversal of 163812220 is 22218361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163812227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1289797 + ... + 1289923.

It is an arithmetic number, because the mean of its divisors is an integer number (2919616).

Almost surely, 2^163812220 is an apocalyptic number.

163812220 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 163812220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210212352).

163812220 is an abundant number, since it is smaller than the sum of its proper divisors (256612484).

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

163812220 is a wasteful number, since it uses less digits than its factorization.

163812220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 163812220 is about 12798.9147977475. The cubic root of 163812220 is about 547.1613746704.

The spelling of 163812220 in words is "one hundred sixty-three million, eight hundred twelve thousand, two hundred twenty".