55222320 has 80 divisors (see below), whose sum is σ = 175203072. Its totient is φ = 14380800.

The previous prime is 55222313. The next prime is 55222327. The reversal of 55222320 is 2322255.

It is an interprime number because it is at equal distance from previous prime (55222313) and next prime (55222327).

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (55222327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7645 + ... + 12995.

Almost surely, 2^55222320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55222320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87601536).

55222320 is an abundant number, since it is smaller than the sum of its proper divisors (119980752).

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

55222320 is a wasteful number, since it uses less digits than its factorization.

55222320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5410 (or 5404 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 55222320 is about 7431.1721820989. The cubic root of 55222320 is about 380.8069647174.

Adding to 55222320 its reverse (2322255), we get a palindrome (57544575).

The spelling of 55222320 in words is "fifty-five million, two hundred twenty-two thousand, three hundred twenty".