55135420 has 36 divisors (see below), whose sum is σ = 123008760. Its totient is φ = 20754688.

The previous prime is 55135373. The next prime is 55135427. The reversal of 55135420 is 2453155.

55135420 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 not an unprimeable number, because it can be changed into a prime (55135427) 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 11 ways as a sum of consecutive naturals, for example, 1011 + ... + 10549.

It is an arithmetic number, because the mean of its divisors is an integer number (3416910).

Almost surely, 2^55135420 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 55135420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61504380).

55135420 is an abundant number, since it is smaller than the sum of its proper divisors (67873340).

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

55135420 is a wasteful number, since it uses less digits than its factorization.

55135420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9582 (or 9563 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 55135420 is about 7425.3228886022. The cubic root of 55135420 is about 380.6071089418.

Adding to 55135420 its reverse (2453155), we get a palindrome (57588575).

It can be divided in two parts, 55135 and 420, that added together give a palindrome (55555).

The spelling of 55135420 in words is "fifty-five million, one hundred thirty-five thousand, four hundred twenty".