55224440 has 16 divisors (see below), whose sum is σ = 124255080. Its totient is φ = 22089760.

The previous prime is 55224401. The next prime is 55224451. The reversal of 55224440 is 4442255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690266 + ... + 690345.

Almost surely, 2^55224440 is an apocalyptic number.

It is an amenable number.

55224440 is an abundant number, since it is smaller than the sum of its proper divisors (69030640).

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

55224440 is a wasteful number, since it uses less digits than its factorization.

55224440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380622 (or 1380618 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 55224440 is about 7431.3148230983. The cubic root of 55224440 is about 380.8118377496.

Adding to 55224440 its reverse (4442255), we get a palindrome (59666695).

The spelling of 55224440 in words is "fifty-five million, two hundred twenty-four thousand, four hundred forty".