163220004 has 72 divisors (see below), whose sum is σ = 432432000. Its totient is φ = 51839424.

The previous prime is 163220003. The next prime is 163220017. The reversal of 163220004 is 400022361.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (163220003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81487 + ... + 83465.

It is an arithmetic number, because the mean of its divisors is an integer number (6006000).

Almost surely, 2^163220004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163220004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216216000).

163220004 is an abundant number, since it is smaller than the sum of its proper divisors (269211996).

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

163220004 is a wasteful number, since it uses less digits than its factorization.

163220004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097 (or 2092 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 163220004 is about 12775.7584510666. The cubic root of 163220004 is about 546.5012102552.

Adding to 163220004 its reverse (400022361), we get a palindrome (563242365).

The spelling of 163220004 in words is "one hundred sixty-three million, two hundred twenty thousand, four".