55504440 has 160 divisors (see below), whose sum is σ = 192012480. Its totient is φ = 14370048.

The previous prime is 55504391. The next prime is 55504441. The reversal of 55504440 is 4440555.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55504441) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 119649 + ... + 120111.

It is an arithmetic number, because the mean of its divisors is an integer number (1200078).

Almost surely, 2^55504440 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 55504440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96006240).

55504440 is an abundant number, since it is smaller than the sum of its proper divisors (136508040).

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

55504440 is a wasteful number, since it uses less digits than its factorization.

55504440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 55504440 is about 7450.1302002046. The cubic root of 55504440 is about 381.4543528663.

Adding to 55504440 its reverse (4440555), we get a palindrome (59944995).

The spelling of 55504440 in words is "fifty-five million, five hundred four thousand, four hundred forty".