55127440 has 20 divisors (see below), whose sum is σ = 128171484. Its totient is φ = 22050944.

The previous prime is 55127431. The next prime is 55127459. The reversal of 55127440 is 4472155.

It can be written as a sum of positive squares in 2 ways, for example, as 19079424 + 36048016 = 4368^2 + 6004^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 55127399 and 55127408.

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 3 ways as a sum of consecutive naturals, for example, 344467 + ... + 344626.

Almost surely, 2^55127440 is an apocalyptic number.

It is an amenable number.

55127440 is an abundant number, since it is smaller than the sum of its proper divisors (73044044).

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

55127440 is a wasteful number, since it uses less digits than its factorization.

55127440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689106 (or 689100 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 55127440 is about 7424.7855187877. The cubic root of 55127440 is about 380.5887457234.

Adding to 55127440 its reverse (4472155), we get a palindrome (59599595).

The spelling of 55127440 in words is "fifty-five million, one hundred twenty-seven thousand, four hundred forty".