55444389 has 64 divisors (see below), whose sum is σ = 102144000. Its totient is φ = 25816320.

The previous prime is 55444387. The next prime is 55444427. The reversal of 55444389 is 98344455.

It is not a de Polignac number, because 55444389 - 2¹ = 55444387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55444389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55444387) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 110862 + ... + 111360.

It is an arithmetic number, because the mean of its divisors is an integer number (1596000).

Almost surely, 2^55444389 is an apocalyptic number.

It is an amenable number.

55444389 is a deficient number, since it is larger than the sum of its proper divisors (46699611).

55444389 is a wasteful number, since it uses less digits than its factorization.

55444389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570.

The product of its digits is 345600, while the sum is 42.

The square root of 55444389 is about 7446.0989115106. The cubic root of 55444389 is about 381.3167363600.

It can be divided in two parts, 55 and 444389, that added together give a palindrome (444444).

The spelling of 55444389 in words is "fifty-five million, four hundred forty-four thousand, three hundred eighty-nine".