22288890 has 64 divisors (see below), whose sum is σ = 58536576. Its totient is φ = 5398272.

The previous prime is 22288879. The next prime is 22288897. The reversal of 22288890 is 9888222.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (22288897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25704 + ... + 26556.

It is an arithmetic number, because the mean of its divisors is an integer number (914634).

Almost surely, 2^22288890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22288890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29268288).

22288890 is an abundant number, since it is smaller than the sum of its proper divisors (36247686).

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

22288890 is a wasteful number, since it uses less digits than its factorization.

22288890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 22288890 is about 4721.1110980361. Note that the first 3 decimals coincide. The cubic root of 22288890 is about 281.4250899888.

The spelling of 22288890 in words is "twenty-two million, two hundred eighty-eight thousand, eight hundred ninety".