52215220 has 12 divisors (see below), whose sum is σ = 109652004. Its totient is φ = 20886080.

The previous prime is 52215199. The next prime is 52215223. The reversal of 52215220 is 2251225.

It can be written as a sum of positive squares in 2 ways, for example, as 18714276 + 33500944 = 4326^2 + 5788^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52215223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1305361 + ... + 1305400.

It is an arithmetic number, because the mean of its divisors is an integer number (9137667).

Almost surely, 2^52215220 is an apocalyptic number.

It is an amenable number.

52215220 is an abundant number, since it is smaller than the sum of its proper divisors (57436784).

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

52215220 is a wasteful number, since it uses less digits than its factorization.

52215220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610770 (or 2610768 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 52215220 is about 7226.0099640120. The cubic root of 52215220 is about 373.7653498690.

Adding to 52215220 its reverse (2251225), we get a palindrome (54466445).

The spelling of 52215220 in words is "fifty-two million, two hundred fifteen thousand, two hundred twenty".