55223320 has 32 divisors (see below), whose sum is σ = 124636320. Its totient is φ = 22021120.

The previous prime is 55223251. The next prime is 55223321. The reversal of 55223320 is 2332255.

It is a junction number, because it is equal to n+sod(n) for n = 55223291 and 55223300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55223321) 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, 12165 + ... + 16075.

It is an arithmetic number, because the mean of its divisors is an integer number (3894885).

Almost surely, 2^55223320 is an apocalyptic number.

It is an amenable number.

55223320 is an abundant number, since it is smaller than the sum of its proper divisors (69413000).

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

55223320 is a wasteful number, since it uses less digits than its factorization.

55223320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4275 (or 4271 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 22.

The square root of 55223320 is about 7431.2394659303. The cubic root of 55223320 is about 380.8092633330.

Adding to 55223320 its reverse (2332255), we get a palindrome (57555575).

The spelling of 55223320 in words is "fifty-five million, two hundred twenty-three thousand, three hundred twenty".