55443320 has 16 divisors (see below), whose sum is σ = 124747560. Its totient is φ = 22177312.

The previous prime is 55443301. The next prime is 55443329. The reversal of 55443320 is 2334455.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 55443320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55443329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693002 + ... + 693081.

Almost surely, 2^55443320 is an apocalyptic number.

It is an amenable number.

55443320 is an abundant number, since it is smaller than the sum of its proper divisors (69304240).

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

55443320 is a wasteful number, since it uses less digits than its factorization.

55443320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386094 (or 1386090 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 55443320 is about 7446.0271286103. The cubic root of 55443320 is about 381.3142856749.

Adding to 55443320 its reverse (2334455), we get a palindrome (57777775).

The spelling of 55443320 in words is "fifty-five million, four hundred forty-three thousand, three hundred twenty".