55423440 has 120 divisors (see below), whose sum is σ = 193091808. Its totient is φ = 14774400.

The previous prime is 55423439. The next prime is 55423453. The reversal of 55423440 is 4432455.

55423440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (27).

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 23 ways as a sum of consecutive naturals, for example, 18015 + ... + 20865.

Almost surely, 2^55423440 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 55423440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96545904).

55423440 is an abundant number, since it is smaller than the sum of its proper divisors (137668368).

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

55423440 is a wasteful number, since it uses less digits than its factorization.

55423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2879 (or 2861 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 55423440 is about 7444.6920688501. The cubic root of 55423440 is about 381.2687049857.

Adding to 55423440 its reverse (4432455), we get a palindrome (59855895).

The spelling of 55423440 in words is "fifty-five million, four hundred twenty-three thousand, four hundred forty".