22217790 has 64 divisors (see below), whose sum is σ = 61332480. Its totient is φ = 5045760.

The previous prime is 22217737. The next prime is 22217791. The reversal of 22217790 is 9771222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22217791) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 50391 + ... + 50829.

It is an arithmetic number, because the mean of its divisors is an integer number (958320).

Almost surely, 2^22217790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22217790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30666240).

22217790 is an abundant number, since it is smaller than the sum of its proper divisors (39114690).

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

22217790 is a wasteful number, since it uses less digits than its factorization.

22217790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 22217790 is about 4713.5750763089. The cubic root of 22217790 is about 281.1255291194.

It can be divided in two parts, 2221 and 7790, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 22217790 in words is "twenty-two million, two hundred seventeen thousand, seven hundred ninety".