55439120 has 80 divisors (see below), whose sum is σ = 142705152. Its totient is φ = 19860480.

The previous prime is 55439101. The next prime is 55439221. The reversal of 55439120 is 2193455.

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

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, 63809 + ... + 64671.

Almost surely, 2^55439120 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 55439120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71352576).

55439120 is an abundant number, since it is smaller than the sum of its proper divisors (87266032).

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

55439120 is a wasteful number, since it uses less digits than its factorization.

55439120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 55439120 is about 7445.7450936760. The cubic root of 55439120 is about 381.3046568598.

The spelling of 55439120 in words is "fifty-five million, four hundred thirty-nine thousand, one hundred twenty".