55040440 has 64 divisors (see below), whose sum is σ = 152429760. Its totient is φ = 17418240.

The previous prime is 55040429. The next prime is 55040459. The reversal of 55040440 is 4404055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3921 + ... + 11200.

It is an arithmetic number, because the mean of its divisors is an integer number (2381715).

Almost surely, 2^55040440 is an apocalyptic number.

It is an amenable number.

55040440 is an abundant number, since it is smaller than the sum of its proper divisors (97389320).

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

55040440 is a wasteful number, since it uses less digits than its factorization.

55040440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15152 (or 15148 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 55040440 is about 7418.9244503499. The cubic root of 55040440 is about 380.3884301489.

Adding to 55040440 its reverse (4404055), we get a palindrome (59444495).

The spelling of 55040440 in words is "fifty-five million, forty thousand, four hundred forty".