28222000 has 80 divisors (see below), whose sum is σ = 69406272. Its totient is φ = 11097600.

The previous prime is 28221971. The next prime is 28222021. The reversal of 28222000 is 22282.

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 (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205932 + ... + 206068.

Almost surely, 2^28222000 is an apocalyptic number.

28222000 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 28222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34703136).

28222000 is an abundant number, since it is smaller than the sum of its proper divisors (41184272).

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

28222000 is a wasteful number, since it uses less digits than its factorization.

28222000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 28222000 is about 5312.4382349351. The cubic root of 28222000 is about 304.4593126018.

Adding to 28222000 its reverse (22282), we get a palindrome (28244282).

The spelling of 28222000 in words is "twenty-eight million, two hundred twenty-two thousand".