55815210 has 64 divisors (see below), whose sum is σ = 162380160. Its totient is φ = 13530240.

The previous prime is 55815191. The next prime is 55815211. The reversal of 55815210 is 1251855.

55815210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (55815211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6427 + ... + 12366.

It is an arithmetic number, because the mean of its divisors is an integer number (2537190).

Almost surely, 2^55815210 is an apocalyptic number.

55815210 is an abundant number, since it is smaller than the sum of its proper divisors (106564950).

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

55815210 is a wasteful number, since it uses less digits than its factorization.

55815210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18820 (or 18814 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 55815210 is about 7470.9577699248. The cubic root of 55815210 is about 382.1649507376.

The spelling of 55815210 in words is "fifty-five million, eight hundred fifteen thousand, two hundred ten".