55621236 has 48 divisors (see below), whose sum is σ = 142990848. Its totient is φ = 16687200.

The previous prime is 55621211. The next prime is 55621259. The reversal of 55621236 is 63212655.

55621236 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 an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11551 + ... + 15641.

It is an arithmetic number, because the mean of its divisors is an integer number (2978976).

Almost surely, 2^55621236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55621236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71495424).

55621236 is an abundant number, since it is smaller than the sum of its proper divisors (87369612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55621236 is a wasteful number, since it uses less digits than its factorization.

55621236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4212 (or 4210 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 55621236 is about 7457.9646016859. The cubic root of 55621236 is about 381.7217256453.

The spelling of 55621236 in words is "fifty-five million, six hundred twenty-one thousand, two hundred thirty-six".