55503728 has 20 divisors (see below), whose sum is σ = 122901360. Its totient is φ = 23787264.

The previous prime is 55503703. The next prime is 55503751. The reversal of 55503728 is 82730555.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247673 + ... + 247896.

It is an arithmetic number, because the mean of its divisors is an integer number (6145068).

Almost surely, 2^55503728 is an apocalyptic number.

It is an amenable number.

55503728 is an abundant number, since it is smaller than the sum of its proper divisors (67397632).

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

55503728 is a wasteful number, since it uses less digits than its factorization.

55503728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495584 (or 495578 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 55503728 is about 7450.0824156515. The cubic root of 55503728 is about 381.4527217856.

The spelling of 55503728 in words is "fifty-five million, five hundred three thousand, seven hundred twenty-eight".