53609220 has 144 divisors (see below), whose sum is σ = 187719168. Its totient is φ = 12130560.

The previous prime is 53609209. The next prime is 53609221. The reversal of 53609220 is 2290635.

53609220 is a `hidden beast` number, since 53 + 609 + 2 + 2 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (53609221) 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, 197685 + ... + 197955.

Almost surely, 2^53609220 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 53609220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93859584).

53609220 is an abundant number, since it is smaller than the sum of its proper divisors (134109948).

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

53609220 is a wasteful number, since it uses less digits than its factorization.

53609220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 53609220 is about 7321.8317380284. The cubic root of 53609220 is about 377.0623438422.

Adding to 53609220 its reverse (2290635), we get a palindrome (55899855).

The spelling of 53609220 in words is "fifty-three million, six hundred nine thousand, two hundred twenty".