22222000 has 80 divisors (see below), whose sum is σ = 55246464. Its totient is φ = 8640000.

The previous prime is 22221977. The next prime is 22222049. The reversal of 22222000 is 22222.

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

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81865 + ... + 82135.

Almost surely, 2^22222000 is an apocalyptic number.

22222000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27623232).

22222000 is an abundant number, since it is smaller than the sum of its proper divisors (33024464).

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

22222000 is a wasteful number, since it uses less digits than its factorization.

22222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 22222000 is about 4714.0216376254. The cubic root of 22222000 is about 281.1432846167.

Adding to 22222000 its reverse (22222), we get a palindrome (22244222).

22222000 divided by its reverse (22222) gives a cube (1000 = 10³).

It can be divided in two parts, 222 and 22000, that added together give a palindrome (22222).

The spelling of 22222000 in words is "twenty-two million, two hundred twenty-two thousand".