55445544 has 192 divisors, whose sum is σ = 191168640. Its totient is φ = 14100480.

The previous prime is 55445543. The next prime is 55445563. The reversal of 55445544 is 44554455.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 55445499 and 55445508.

It is not an unprimeable number, because it can be changed into a prime (55445543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 404644 + ... + 404780.

It is an arithmetic number, because the mean of its divisors is an integer number (995670).

Almost surely, 2^55445544 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 55445544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95584320).

55445544 is an abundant number, since it is smaller than the sum of its proper divisors (135723096).

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

55445544 is a wasteful number, since it uses less digits than its factorization.

55445544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 233 counting only the distinct ones).

The product of its digits is 160000, while the sum is 36.

The square root of 55445544 is about 7446.1764684971. The cubic root of 55445544 is about 381.3193841649.

Adding to 55445544 its reverse (44554455), we get a palindrome (99999999).

The spelling of 55445544 in words is "fifty-five million, four hundred forty-five thousand, five hundred forty-four".