55203440 has 40 divisors (see below), whose sum is σ = 129567600. Its totient is φ = 21871616.

The previous prime is 55203439. The next prime is 55203451. The reversal of 55203440 is 4430255.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5336 + ... + 11784.

It is an arithmetic number, because the mean of its divisors is an integer number (3239190).

Almost surely, 2^55203440 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 55203440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64783800).

55203440 is an abundant number, since it is smaller than the sum of its proper divisors (74364160).

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

55203440 is a wasteful number, since it uses less digits than its factorization.

55203440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6569 (or 6563 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 55203440 is about 7429.9017490139. The cubic root of 55203440 is about 380.7635616453.

Adding to 55203440 its reverse (4430255), we get a palindrome (59633695).

The spelling of 55203440 in words is "fifty-five million, two hundred three thousand, four hundred forty".