55240444 has 18 divisors (see below), whose sum is σ = 112454160. Its totient is φ = 23674392.

The previous prime is 55240439. The next prime is 55240453. The reversal of 55240444 is 44404255.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140724 + ... + 141115.

Almost surely, 2^55240444 is an apocalyptic number.

It is an amenable number.

55240444 is an abundant number, since it is smaller than the sum of its proper divisors (57213716).

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

55240444 is a wasteful number, since it uses less digits than its factorization.

55240444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281857 (or 281848 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 28.

The square root of 55240444 is about 7432.3915397401. The cubic root of 55240444 is about 380.8486205220.

Adding to 55240444 its reverse (44404255), we get a palindrome (99644699).

The spelling of 55240444 in words is "fifty-five million, two hundred forty thousand, four hundred forty-four".