55200440 has 32 divisors (see below), whose sum is σ = 124433280. Its totient is φ = 22038912.

The previous prime is 55200407. The next prime is 55200443. The reversal of 55200440 is 4400255.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55200443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29369 + ... + 31191.

It is an arithmetic number, because the mean of its divisors is an integer number (3888540).

Almost surely, 2^55200440 is an apocalyptic number.

It is an amenable number.

55200440 is an abundant number, since it is smaller than the sum of its proper divisors (69232840).

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

55200440 is a wasteful number, since it uses less digits than its factorization.

55200440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591 (or 2587 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 55200440 is about 7429.6998593483. The cubic root of 55200440 is about 380.7566640596.

Adding to 55200440 its reverse (4400255), we get a palindrome (59600695).

The spelling of 55200440 in words is "fifty-five million, two hundred thousand, four hundred forty".