55840728 has 32 divisors (see below), whose sum is σ = 140276160. Its totient is φ = 18523680.

The previous prime is 55840721. The next prime is 55840739. The reversal of 55840728 is 82704855.

55840728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55840721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450 + ... + 10577.

It is an arithmetic number, because the mean of its divisors is an integer number (4383630).

Almost surely, 2^55840728 is an apocalyptic number.

It is an amenable number.

55840728 is an abundant number, since it is smaller than the sum of its proper divisors (84435432).

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

55840728 is a wasteful number, since it uses less digits than its factorization.

55840728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11247 (or 11243 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 55840728 is about 7472.6653879322. The cubic root of 55840728 is about 382.2231821731.

The spelling of 55840728 in words is "fifty-five million, eight hundred forty thousand, seven hundred twenty-eight".