52511220 has 96 divisors (see below), whose sum is σ = 166924800. Its totient is φ = 13698432.

The previous prime is 52511203. The next prime is 52511227. The reversal of 52511220 is 2211525.

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 = 52511193 and 52511202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52511227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24346 + ... + 26414.

It is an arithmetic number, because the mean of its divisors is an integer number (1738800).

Almost surely, 2^52511220 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 52511220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83462400).

52511220 is an abundant number, since it is smaller than the sum of its proper divisors (114413580).

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

52511220 is a wasteful number, since it uses less digits than its factorization.

52511220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134 (or 2126 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 52511220 is about 7246.4625852895. The cubic root of 52511220 is about 374.4702921111.

Adding to 52511220 its reverse (2211525), we get a palindrome (54722745).

The spelling of 52511220 in words is "fifty-two million, five hundred eleven thousand, two hundred twenty".