55243620 has 108 divisors (see below), whose sum is σ = 174421884. Its totient is φ = 14696640.

The previous prime is 55243619. The next prime is 55243651. The reversal of 55243620 is 2634255.

It can be written as a sum of positive squares in 2 ways, for example, as 6718464 + 48525156 = 2592^2 + 6966^2 .

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 131010 + ... + 131430.

Almost surely, 2^55243620 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 55243620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87210942).

55243620 is an abundant number, since it is smaller than the sum of its proper divisors (119178264).

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

55243620 is an equidigital number, since it uses as much as digits as its factorization.

55243620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 55243620 is about 7432.6051960265. The cubic root of 55243620 is about 380.8559192325.

Adding to 55243620 its reverse (2634255), we get a palindrome (57877875).

The spelling of 55243620 in words is "fifty-five million, two hundred forty-three thousand, six hundred twenty".