55372240 has 160 divisors (see below), whose sum is σ = 163918080. Its totient is φ = 16896000.

The previous prime is 55372199. The next prime is 55372243. The reversal of 55372240 is 4227355.

55372240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 55372199 and 55372208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55372243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 548190 + ... + 548290.

It is an arithmetic number, because the mean of its divisors is an integer number (1024488).

Almost surely, 2^55372240 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 55372240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81959040).

55372240 is an abundant number, since it is smaller than the sum of its proper divisors (108545840).

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

55372240 is a wasteful number, since it uses less digits than its factorization.

55372240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 55372240 is about 7441.2525827309. The cubic root of 55372240 is about 381.1512638698.

Adding to 55372240 its reverse (4227355), we get a palindrome (59599595).

It can be divided in two parts, 5537 and 2240, that added together give a palindrome (7777).

The spelling of 55372240 in words is "fifty-five million, three hundred seventy-two thousand, two hundred forty".