55127840 has 72 divisors (see below), whose sum is σ = 135977940. Its totient is φ = 21095424.

The previous prime is 55127837. The next prime is 55127867. The reversal of 55127840 is 4872155.

It can be written as a sum of positive squares in 6 ways, for example, as 35378704 + 19749136 = 5948^2 + 4444^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 55127797 and 55127806.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 505706 + ... + 505814.

Almost surely, 2^55127840 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 55127840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67988970).

55127840 is an abundant number, since it is smaller than the sum of its proper divisors (80850100).

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

55127840 is a wasteful number, since it uses less digits than its factorization.

55127840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 55127840 is about 7424.8124555439. The cubic root of 55127840 is about 380.5896662277.

Adding to 55127840 its reverse (4872155), we get a palindrome (59999995).

The spelling of 55127840 in words is "fifty-five million, one hundred twenty-seven thousand, eight hundred forty".