55481728 has 32 divisors (see below), whose sum is σ = 111432960. Its totient is φ = 27514368.

The previous prime is 55481719. The next prime is 55481737. The reversal of 55481728 is 82718455.

It is an interprime number because it is at equal distance from previous prime (55481719) and next prime (55481737).

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14550 + ... + 17962.

It is an arithmetic number, because the mean of its divisors is an integer number (3482280).

Almost surely, 2^55481728 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 55481728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55716480).

55481728 is an abundant number, since it is smaller than the sum of its proper divisors (55951232).

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

55481728 is a wasteful number, since it uses less digits than its factorization.

55481728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3554 (or 3542 counting only the distinct ones).

The product of its digits is 89600, while the sum is 40.

The square root of 55481728 is about 7448.6057755797. The cubic root of 55481728 is about 381.4023163492.

The spelling of 55481728 in words is "fifty-five million, four hundred eighty-one thousand, seven hundred twenty-eight".