55120140 has 144 divisors (see below), whose sum is σ = 179262720. Its totient is φ = 13668480.

The previous prime is 55120127. The next prime is 55120147. The reversal of 55120140 is 4102155.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55120147) 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, 242707 + ... + 242933.

It is an arithmetic number, because the mean of its divisors is an integer number (1244880).

Almost surely, 2^55120140 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 55120140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89631360).

55120140 is an abundant number, since it is smaller than the sum of its proper divisors (124142580).

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

55120140 is a wasteful number, since it uses less digits than its factorization.

55120140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 55120140 is about 7424.2939058203. The cubic root of 55120140 is about 380.5719457385.

Adding to 55120140 its reverse (4102155), we get a palindrome (59222295).

The spelling of 55120140 in words is "fifty-five million, one hundred twenty thousand, one hundred forty".