55104140 has 144 divisors (see below), whose sum is σ = 152736192. Its totient is φ = 16293888.

The previous prime is 55104131. The next prime is 55104149. The reversal of 55104140 is 4140155.

It is an interprime number because it is at equal distance from previous prime (55104131) and next prime (55104149).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (55104149) 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 47 ways as a sum of consecutive naturals, for example, 402152 + ... + 402288.

It is an arithmetic number, because the mean of its divisors is an integer number (1060668).

Almost surely, 2^55104140 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 55104140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76368096).

55104140 is an abundant number, since it is smaller than the sum of its proper divisors (97632052).

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

55104140 is a wasteful number, since it uses less digits than its factorization.

55104140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 55104140 is about 7423.2162840645. The cubic root of 55104140 is about 380.5351186646.

Adding to 55104140 its reverse (4140155), we get a palindrome (59244295).

The spelling of 55104140 in words is "fifty-five million, one hundred four thousand, one hundred forty".