22218072 has 32 divisors (see below), whose sum is σ = 57338880. Its totient is φ = 7166880.

The previous prime is 22218067. The next prime is 22218083. The reversal of 22218072 is 27081222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14188 + ... + 15675.

It is an arithmetic number, because the mean of its divisors is an integer number (1791840).

Almost surely, 2^22218072 is an apocalyptic number.

It is an amenable number.

22218072 is an abundant number, since it is smaller than the sum of its proper divisors (35120808).

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

22218072 is a wasteful number, since it uses less digits than its factorization.

22218072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29903 (or 29899 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 22218072 is about 4713.6049898141. The cubic root of 22218072 is about 281.1267185126.

Adding to 22218072 its reverse (27081222), we get a palindrome (49299294).

The spelling of 22218072 in words is "twenty-two million, two hundred eighteen thousand, seventy-two".