52218660 has 48 divisors (see below), whose sum is σ = 157461696. Its totient is φ = 12853632.

The previous prime is 52218653. The next prime is 52218697. The reversal of 52218660 is 6681225.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32694 + ... + 34253.

It is an arithmetic number, because the mean of its divisors is an integer number (3280452).

Almost surely, 2^52218660 is an apocalyptic number.

It is an amenable number.

52218660 is an abundant number, since it is smaller than the sum of its proper divisors (105243036).

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

52218660 is a wasteful number, since it uses less digits than its factorization.

52218660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66972 (or 66970 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 52218660 is about 7226.2479891020. The cubic root of 52218660 is about 373.7735577221.

Adding to 52218660 its reverse (6681225), we get a palindrome (58899885).

The spelling of 52218660 in words is "fifty-two million, two hundred eighteen thousand, six hundred sixty".