55028581 has 4 divisors (see below), whose sum is σ = 57421152. Its totient is φ = 52636012.

The previous prime is 55028569. The next prime is 55028629. The reversal of 55028581 is 18582055.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55028581 - 2⁵ = 55028549 is a prime.

It is a super-2 number, since 2×55028581² = 6056289453747122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55028521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1196251 + ... + 1196296.

It is an arithmetic number, because the mean of its divisors is an integer number (14355288).

Almost surely, 2^55028581 is an apocalyptic number.

It is an amenable number.

55028581 is a deficient number, since it is larger than the sum of its proper divisors (2392571).

55028581 is a wasteful number, since it uses less digits than its factorization.

55028581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392570.

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 55028581 is about 7418.1251674530. The cubic root of 55028581 is about 380.3611087199.

The spelling of 55028581 in words is "fifty-five million, twenty-eight thousand, five hundred eighty-one".