55385728 has 32 divisors (see below), whose sum is σ = 116833860. Its totient is φ = 26062848.

The previous prime is 55385683. The next prime is 55385749. The reversal of 55385728 is 82758355.

It can be written as a sum of positive squares in 2 ways, for example, as 54287424 + 1098304 = 7368^2 + 1048^2 .

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

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, 10551 + ... + 14902.

Almost surely, 2^55385728 is an apocalyptic number.

It is an amenable number.

55385728 is an abundant number, since it is smaller than the sum of its proper divisors (61448132).

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

55385728 is a wasteful number, since it uses less digits than its factorization.

55385728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25484 (or 25472 counting only the distinct ones).

The product of its digits is 336000, while the sum is 43.

The square root of 55385728 is about 7442.1588265771. The cubic root of 55385728 is about 381.1822092851.

The spelling of 55385728 in words is "fifty-five million, three hundred eighty-five thousand, seven hundred twenty-eight".