52515220 has 12 divisors (see below), whose sum is σ = 110282004. Its totient is φ = 21006080.

The previous prime is 52515217. The next prime is 52515263. The reversal of 52515220 is 2251525.

It can be written as a sum of positive squares in 2 ways, for example, as 13527684 + 38987536 = 3678^2 + 6244^2 .

It is a junction number, because it is equal to n+sod(n) for n = 52515191 and 52515200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1312861 + ... + 1312900.

It is an arithmetic number, because the mean of its divisors is an integer number (9190167).

Almost surely, 2^52515220 is an apocalyptic number.

It is an amenable number.

52515220 is an abundant number, since it is smaller than the sum of its proper divisors (57766784).

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

52515220 is a wasteful number, since it uses less digits than its factorization.

52515220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625770 (or 2625768 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 52515220 is about 7246.7385767668. The cubic root of 52515220 is about 374.4798001943.

Adding to 52515220 its reverse (2251525), we get a palindrome (54766745).

The spelling of 52515220 in words is "fifty-two million, five hundred fifteen thousand, two hundred twenty".