52215660 has 144 divisors (see below), whose sum is σ = 187387200. Its totient is φ = 11515392.

The previous prime is 52215643. The next prime is 52215661. The reversal of 52215660 is 6651225.

It is not an unprimeable number, because it can be changed into a prime (52215661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35826 + ... + 37254.

It is an arithmetic number, because the mean of its divisors is an integer number (1301300).

Almost surely, 2^52215660 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 52215660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93693600).

52215660 is an abundant number, since it is smaller than the sum of its proper divisors (135171540).

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

52215660 is a wasteful number, since it uses less digits than its factorization.

52215660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480 (or 1475 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 52215660 is about 7226.0404095189. The cubic root of 52215660 is about 373.7663997308.

Adding to 52215660 its reverse (6651225), we get a palindrome (58866885).

The spelling of 52215660 in words is "fifty-two million, two hundred fifteen thousand, six hundred sixty".