52313220 has 72 divisors (see below), whose sum is σ = 159746496. Its totient is φ = 13856832.

The previous prime is 52313197. The next prime is 52313231. The reversal of 52313220 is 2231325.

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 = 52313193 and 52313202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28449 + ... + 30231.

Almost surely, 2^52313220 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 52313220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79873248).

52313220 is an abundant number, since it is smaller than the sum of its proper divisors (107433276).

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

52313220 is a wasteful number, since it uses less digits than its factorization.

52313220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961 (or 1956 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 52313220 is about 7232.7878442548. The cubic root of 52313220 is about 373.9990372400. Note that the first 3 decimals are identical.

Adding to 52313220 its reverse (2231325), we get a palindrome (54544545).

The spelling of 52313220 in words is "fifty-two million, three hundred thirteen thousand, two hundred twenty".