55445240 has 32 divisors (see below), whose sum is σ = 128126880. Its totient is φ = 21578112.

The previous prime is 55445239. The next prime is 55445311. The reversal of 55445240 is 4254455.

55445240 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 7 ways as a sum of consecutive naturals, for example, 17252 + ... + 20211.

It is an arithmetic number, because the mean of its divisors is an integer number (4003965).

Almost surely, 2^55445240 is an apocalyptic number.

It is an amenable number.

55445240 is an abundant number, since it is smaller than the sum of its proper divisors (72681640).

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

55445240 is a wasteful number, since it uses less digits than its factorization.

55445240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37511 (or 37507 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 29.

The square root of 55445240 is about 7446.1560553080. The cubic root of 55445240 is about 381.3186872570.

Adding to 55445240 its reverse (4254455), we get a palindrome (59699695).

The spelling of 55445240 in words is "fifty-five million, four hundred forty-five thousand, two hundred forty".