55222000 has 40 divisors (see below), whose sum is σ = 133531632. Its totient is φ = 22088000.

The previous prime is 55221997. The next prime is 55222009. The reversal of 55222000 is 22255.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55222009) 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, 11806 + ... + 15805.

Almost surely, 2^55222000 is an apocalyptic number.

55222000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55222000 is an abundant number, since it is smaller than the sum of its proper divisors (78309632).

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

55222000 is a wasteful number, since it uses less digits than its factorization.

55222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27634 (or 27618 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 55222000 is about 7431.1506511441. The cubic root of 55222000 is about 380.8062291545.

Adding to 55222000 its reverse (22255), we get a palindrome (55244255).

The spelling of 55222000 in words is "fifty-five million, two hundred twenty-two thousand".