22187790 has 64 divisors (see below), whose sum is σ = 60793920. Its totient is φ = 5754240.

The previous prime is 22187773. The next prime is 22187821. The reversal of 22187790 is 9778122.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8880 + ... + 11100.

It is an arithmetic number, because the mean of its divisors is an integer number (949905).

Almost surely, 2^22187790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22187790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30396960).

22187790 is an abundant number, since it is smaller than the sum of its proper divisors (38606130).

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

22187790 is a wasteful number, since it uses less digits than its factorization.

22187790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274 (or 2268 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 22187790 is about 4710.3917034574. The cubic root of 22187790 is about 280.9989404012.

The spelling of 22187790 in words is "twenty-two million, one hundred eighty-seven thousand, seven hundred ninety".