55404240 has 80 divisors (see below), whose sum is σ = 179238528. Its totient is φ = 14130688.

The previous prime is 55404227. The next prime is 55404313. The reversal of 55404240 is 4240455.

55404240 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 (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 55404240.

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 15 ways as a sum of consecutive naturals, for example, 502 + ... + 10538.

Almost surely, 2^55404240 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 55404240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89619264).

55404240 is an abundant number, since it is smaller than the sum of its proper divisors (123834288).

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

55404240 is a wasteful number, since it uses less digits than its factorization.

55404240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10076 (or 10070 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 55404240 is about 7443.4024478057. The cubic root of 55404240 is about 381.2246730465.

Adding to 55404240 its reverse (4240455), we get a palindrome (59644695).

The spelling of 55404240 in words is "fifty-five million, four hundred four thousand, two hundred forty".