55055920 has 80 divisors (see below), whose sum is σ = 139500000. Its totient is φ = 20127744.

The previous prime is 55055893. The next prime is 55055921. The reversal of 55055920 is 2955055.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55055921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43456 + ... + 44704.

It is an arithmetic number, because the mean of its divisors is an integer number (1743750).

Almost surely, 2^55055920 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 55055920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69750000).

55055920 is an abundant number, since it is smaller than the sum of its proper divisors (84444080).

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

55055920 is a wasteful number, since it uses less digits than its factorization.

55055920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310 (or 1304 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 31.

The square root of 55055920 is about 7419.9676549160. The cubic root of 55055920 is about 380.4240879364.

The spelling of 55055920 in words is "fifty-five million, fifty-five thousand, nine hundred twenty".