55560440 has 48 divisors (see below), whose sum is σ = 135383400. Its totient is φ = 20512128.

The previous prime is 55560419. The next prime is 55560443. The reversal of 55560440 is 4406555.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55560443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2651 + ... + 10869.

Almost surely, 2^55560440 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 55560440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67691700).

55560440 is an abundant number, since it is smaller than the sum of its proper divisors (79822960).

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

55560440 is a wasteful number, since it uses less digits than its factorization.

55560440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8256 (or 8239 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 55560440 is about 7453.8875762920. The cubic root of 55560440 is about 381.5825964430.

Adding to 55560440 its reverse (4406555), we get a palindrome (59966995).

The spelling of 55560440 in words is "fifty-five million, five hundred sixty thousand, four hundred forty".