4511220 has 96 divisors (see below), whose sum is σ = 15095808. Its totient is φ = 984192.

The previous prime is 4511219. The next prime is 4511231. The reversal of 4511220 is 221154.

It is a super-2 number, since 2×4511220² = 40702211776800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 4511220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9427 + ... + 9893.

It is an arithmetic number, because the mean of its divisors is an integer number (157248).

Almost surely, 2^4511220 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 4511220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7547904).

4511220 is an abundant number, since it is smaller than the sum of its proper divisors (10584588).

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

4511220 is a wasteful number, since it uses less digits than its factorization.

4511220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 507 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 4511220 is about 2123.9632765187. The cubic root of 4511220 is about 165.2334619841.

Adding to 4511220 its reverse (221154), we get a palindrome (4732374).

The spelling of 4511220 in words is "four million, five hundred eleven thousand, two hundred twenty".