55551444 has 48 divisors (see below), whose sum is σ = 147809088. Its totient is φ = 16086528.

The previous prime is 55551437. The next prime is 55551449. The reversal of 55551444 is 44415555.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55551449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7822 + ... + 13125.

It is an arithmetic number, because the mean of its divisors is an integer number (3079356).

Almost surely, 2^55551444 is an apocalyptic number.

It is an amenable number.

55551444 is an abundant number, since it is smaller than the sum of its proper divisors (92257644).

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

55551444 is a wasteful number, since it uses less digits than its factorization.

55551444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20984 (or 20982 counting only the distinct ones).

The product of its digits is 40000, while the sum is 33.

The square root of 55551444 is about 7453.2841083646. The cubic root of 55551444 is about 381.5620008398.

Adding to 55551444 its reverse (44415555), we get a palindrome (99966999).

The spelling of 55551444 in words is "fifty-five million, five hundred fifty-one thousand, four hundred forty-four".