22642890 has 32 divisors (see below), whose sum is σ = 55814400. Its totient is φ = 5874624.

The previous prime is 22642883. The next prime is 22642891. The reversal of 22642890 is 9824622.

It is not an unprimeable number, because it can be changed into a prime (22642891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9090 + ... + 11309.

It is an arithmetic number, because the mean of its divisors is an integer number (1744200).

Almost surely, 2^22642890 is an apocalyptic number.

22642890 is an abundant number, since it is smaller than the sum of its proper divisors (33171510).

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

22642890 is a wasteful number, since it uses less digits than its factorization.

22642890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20446.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 22642890 is about 4758.4545810589. The cubic root of 22642890 is about 282.9071686266.

It can be divided in two parts, 22642 and 890, that added together give a palindrome (23532).

The spelling of 22642890 in words is "twenty-two million, six hundred forty-two thousand, eight hundred ninety".