55085380 has 48 divisors (see below), whose sum is σ = 132806016. Its totient is φ = 18800640.

The previous prime is 55085309. The next prime is 55085399. The reversal of 55085380 is 8358055.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35215 + ... + 36745.

It is an arithmetic number, because the mean of its divisors is an integer number (2766792).

Almost surely, 2^55085380 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 55085380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66403008).

55085380 is an abundant number, since it is smaller than the sum of its proper divisors (77720636).

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

55085380 is a wasteful number, since it uses less digits than its factorization.

55085380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804 (or 1802 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 55085380 is about 7421.9525732788. The cubic root of 55085380 is about 380.4919298400.

The spelling of 55085380 in words is "fifty-five million, eighty-five thousand, three hundred eighty".