55128318 has 16 divisors (see below), whose sum is σ = 126007680. Its totient is φ = 15750936.

The previous prime is 55128317. The next prime is 55128341. The reversal of 55128318 is 81382155.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55128317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656248 + ... + 656331.

It is an arithmetic number, because the mean of its divisors is an integer number (7875480).

Almost surely, 2^55128318 is an apocalyptic number.

55128318 is an abundant number, since it is smaller than the sum of its proper divisors (70879362).

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

55128318 is a wasteful number, since it uses less digits than its factorization.

55128318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312591.

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

The square root of 55128318 is about 7424.8446448394. The cubic root of 55128318 is about 380.5907662244.

The spelling of 55128318 in words is "fifty-five million, one hundred twenty-eight thousand, three hundred eighteen".