55120120 has 64 divisors (see below), whose sum is σ = 143272800. Its totient is φ = 18862080.

The previous prime is 55120099. The next prime is 55120123. The reversal of 55120120 is 2102155.

It is a junction number, because it is equal to n+sod(n) for n = 55120094 and 55120103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55120123) 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, 3796 + ... + 11164.

Almost surely, 2^55120120 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 55120120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71636400).

55120120 is an abundant number, since it is smaller than the sum of its proper divisors (88152680).

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

55120120 is a wasteful number, since it uses less digits than its factorization.

55120120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7408 (or 7404 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 55120120 is about 7424.2925588907. The cubic root of 55120120 is about 380.5718997091.

Adding to 55120120 its reverse (2102155), we get a palindrome (57222275).

The spelling of 55120120 in words is "fifty-five million, one hundred twenty thousand, one hundred twenty".