55728166 has 8 divisors (see below), whose sum is σ = 90022464. Its totient is φ = 25720680.

The previous prime is 55728163. The next prime is 55728181. The reversal of 55728166 is 66182755.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55728161) by changing a digit.

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, 1071670 + ... + 1071721.

It is an arithmetic number, because the mean of its divisors is an integer number (11252808).

Almost surely, 2^55728166 is an apocalyptic number.

55728166 is a deficient number, since it is larger than the sum of its proper divisors (34294298).

55728166 is a wasteful number, since it uses less digits than its factorization.

55728166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143406.

The product of its digits is 100800, while the sum is 40.

The square root of 55728166 is about 7465.1300055659. The cubic root of 55728166 is about 381.9661848854.

The spelling of 55728166 in words is "fifty-five million, seven hundred twenty-eight thousand, one hundred sixty-six".