55528581 has 8 divisors (see below), whose sum is σ = 74099520. Its totient is φ = 36988352.

The previous prime is 55528567. The next prime is 55528597. The reversal of 55528581 is 18582555.

55528581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 55528581 - 2¹¹ = 55526533 is a prime.

It is a super-2 number, since 2×55528581² = 6166846615747122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55528531) 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, 3060 + ... + 10973.

It is an arithmetic number, because the mean of its divisors is an integer number (9262440).

Almost surely, 2^55528581 is an apocalyptic number.

It is an amenable number.

55528581 is a deficient number, since it is larger than the sum of its proper divisors (18570939).

55528581 is a wasteful number, since it uses less digits than its factorization.

55528581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15355.

The product of its digits is 80000, while the sum is 39.

The square root of 55528581 is about 7451.7501971013. The cubic root of 55528581 is about 381.5096478708.

The spelling of 55528581 in words is "fifty-five million, five hundred twenty-eight thousand, five hundred eighty-one".