55844040 has 128 divisors (see below), whose sum is σ = 201600000. Its totient is φ = 12089088.

The previous prime is 55844027. The next prime is 55844083. The reversal of 55844040 is 4044855.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55843989 and 55844007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14211 + ... + 17709.

It is an arithmetic number, because the mean of its divisors is an integer number (1575000).

Almost surely, 2^55844040 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 55844040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100800000).

55844040 is an abundant number, since it is smaller than the sum of its proper divisors (145755960).

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

55844040 is a wasteful number, since it uses less digits than its factorization.

55844040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539 (or 3535 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 55844040 is about 7472.8869923210. The cubic root of 55844040 is about 382.2307387732.

Adding to 55844040 its reverse (4044855), we get a palindrome (59888895).

The spelling of 55844040 in words is "fifty-five million, eight hundred forty-four thousand, forty".