55506318 has 40 divisors (see below), whose sum is σ = 129540648. Its totient is φ = 15854832.

The previous prime is 55506313. The next prime is 55506329. The reversal of 55506318 is 81360555.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55506313) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12480 + ... + 16332.

Almost surely, 2^55506318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55506318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64770324).

55506318 is an abundant number, since it is smaller than the sum of its proper divisors (74034330).

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

55506318 is an equidigital number, since it uses as much as digits as its factorization.

55506318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886 (or 3865 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 55506318 is about 7450.2562372042. The cubic root of 55506318 is about 381.4586550037.

The spelling of 55506318 in words is "fifty-five million, five hundred six thousand, three hundred eighteen".