161024220 has 192 divisors, whose sum is σ = 587059200. Its totient is φ = 35873280.

The previous prime is 161024197. The next prime is 161024231. The reversal of 161024220 is 22420161.

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

It is a junction number, because it is equal to n+sod(n) for n = 161024193 and 161024202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 154461 + ... + 155499.

It is an arithmetic number, because the mean of its divisors is an integer number (3057600).

Almost surely, 2^161024220 is an apocalyptic number.

161024220 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 161024220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293529600).

161024220 is an abundant number, since it is smaller than the sum of its proper divisors (426034980).

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

161024220 is a wasteful number, since it uses less digits than its factorization.

161024220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 161024220 is about 12689.5319062604. The cubic root of 161024220 is about 544.0394606251.

Adding to 161024220 its reverse (22420161), we get a palindrome (183444381).

The spelling of 161024220 in words is "one hundred sixty-one million, twenty-four thousand, two hundred twenty".