55191028 has 12 divisors (see below), whose sum is σ = 97487712. Its totient is φ = 27337400.

The previous prime is 55191023. The next prime is 55191077. The reversal of 55191028 is 82019155.

55191028 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 (55191023) 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 3 ways as a sum of consecutive naturals, for example, 64048 + ... + 64903.

It is an arithmetic number, because the mean of its divisors is an integer number (8123976).

Almost surely, 2^55191028 is an apocalyptic number.

It is an amenable number.

55191028 is a deficient number, since it is larger than the sum of its proper divisors (42296684).

55191028 is a wasteful number, since it uses less digits than its factorization.

55191028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129062 (or 129060 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 55191028 is about 7429.0664285629. The cubic root of 55191028 is about 380.7350224119.

The spelling of 55191028 in words is "fifty-five million, one hundred ninety-one thousand, twenty-eight".