55318128 has 80 divisors (see below), whose sum is σ = 151061760. Its totient is φ = 17408512.

The previous prime is 55318121. The next prime is 55318129. The reversal of 55318128 is 82181355.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55318121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97975 + ... + 98537.

It is an arithmetic number, because the mean of its divisors is an integer number (1888272).

Almost surely, 2^55318128 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 55318128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75530880).

55318128 is an abundant number, since it is smaller than the sum of its proper divisors (95743632).

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

55318128 is a wasteful number, since it uses less digits than its factorization.

55318128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 680 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

The square root of 55318128 is about 7437.6157469985. The cubic root of 55318128 is about 381.0270645760.

It can be divided in two parts, 553 and 18128, that added together give a palindrome (18681).

The spelling of 55318128 in words is "fifty-five million, three hundred eighteen thousand, one hundred twenty-eight".