55105830 has 72 divisors (see below), whose sum is σ = 155186928. Its totient is φ = 13560768.

The previous prime is 55105801. The next prime is 55105837. The reversal of 55105830 is 3850155.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 55105794 and 55105803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55105837) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13399 + ... + 17021.

It is an arithmetic number, because the mean of its divisors is an integer number (2155374).

Almost surely, 2^55105830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55105830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77593464).

55105830 is an abundant number, since it is smaller than the sum of its proper divisors (100081098).

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

55105830 is a wasteful number, since it uses less digits than its factorization.

55105830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3662 (or 3646 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 55105830 is about 7423.3301152515. The cubic root of 55105830 is about 380.5390088610.

Adding to 55105830 its reverse (3850155), we get a palindrome (58955985).

The spelling of 55105830 in words is "fifty-five million, one hundred five thousand, eight hundred thirty".