55988821 has 36 divisors (see below), whose sum is σ = 71317260. Its totient is φ = 43747200.

The previous prime is 55988809. The next prime is 55988827. The reversal of 55988821 is 12888955.

55988821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13608721 + 42380100 = 3689^2 + 6510^2 .

It is not a de Polignac number, because 55988821 - 2¹¹ = 55986773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55988827) 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 35 ways as a sum of consecutive naturals, for example, 1365561 + ... + 1365601.

It is an arithmetic number, because the mean of its divisors is an integer number (1981035).

Almost surely, 2^55988821 is an apocalyptic number.

It is an amenable number.

55988821 is a deficient number, since it is larger than the sum of its proper divisors (15328439).

55988821 is a wasteful number, since it uses less digits than its factorization.

55988821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 108 counting only the distinct ones).

The product of its digits is 230400, while the sum is 46.

The square root of 55988821 is about 7482.5678079119. The cubic root of 55988821 is about 382.5607769345.

The spelling of 55988821 in words is "fifty-five million, nine hundred eighty-eight thousand, eight hundred twenty-one".