55521544 has 64 divisors (see below), whose sum is σ = 119070000. Its totient is φ = 24084480.

The previous prime is 55521511. The next prime is 55521547. The reversal of 55521544 is 44512555.

It can be written as a sum of positive squares in 8 ways, for example, as 7496644 + 48024900 = 2738^2 + 6930^2 .

It is not an unprimeable number, because it can be changed into a prime (55521547) 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 15 ways as a sum of consecutive naturals, for example, 123432 + ... + 123880.

Almost surely, 2^55521544 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 55521544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59535000).

55521544 is an abundant number, since it is smaller than the sum of its proper divisors (63548456).

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

55521544 is a wasteful number, since it uses less digits than its factorization.

55521544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 534 counting only the distinct ones).

The product of its digits is 20000, while the sum is 31.

The square root of 55521544 is about 7451.2780111871. The cubic root of 55521544 is about 381.4935312647.

It can be divided in two parts, 55521 and 544, that added together give a palindrome (56065).

The spelling of 55521544 in words is "fifty-five million, five hundred twenty-one thousand, five hundred forty-four".