55503440 has 20 divisors (see below), whose sum is σ = 129045684. Its totient is φ = 22201344.

The previous prime is 55503431. The next prime is 55503443. The reversal of 55503440 is 4430555.

55503440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10291264 + 45212176 = 3208^2 + 6724^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55503443) 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 3 ways as a sum of consecutive naturals, for example, 346817 + ... + 346976.

Almost surely, 2^55503440 is an apocalyptic number.

It is an amenable number.

55503440 is an abundant number, since it is smaller than the sum of its proper divisors (73542244).

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

55503440 is a wasteful number, since it uses less digits than its factorization.

55503440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693806 (or 693800 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 55503440 is about 7450.0630869812. The cubic root of 55503440 is about 381.4520620186.

Adding to 55503440 its reverse (4430555), we get a palindrome (59933995).

The spelling of 55503440 in words is "fifty-five million, five hundred three thousand, four hundred forty".