55405444 has 12 divisors (see below), whose sum is σ = 102062800. Its totient is φ = 26244648.

The previous prime is 55405417. The next prime is 55405447. The reversal of 55405444 is 44450455.

It is a happy number.

55405444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (55405447) 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, 364434 + ... + 364585.

Almost surely, 2^55405444 is an apocalyptic number.

It is an amenable number.

55405444 is a deficient number, since it is larger than the sum of its proper divisors (46657356).

55405444 is a wasteful number, since it uses less digits than its factorization.

55405444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729042 (or 729040 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 31.

The square root of 55405444 is about 7443.4833243583. The cubic root of 55405444 is about 381.2274345150.

Adding to 55405444 its reverse (44450455), we get a palindrome (99855899).

The spelling of 55405444 in words is "fifty-five million, four hundred five thousand, four hundred forty-four".