22821890 has 64 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 6981120.

The previous prime is 22821847. The next prime is 22821901. The reversal of 22821890 is 9812822.

It is a Curzon 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, 27806 + ... + 28614.

It is an arithmetic number, because the mean of its divisors is an integer number (816480).

Almost surely, 2^22821890 is an apocalyptic number.

22821890 is an abundant number, since it is smaller than the sum of its proper divisors (29432830).

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

22821890 is a wasteful number, since it uses less digits than its factorization.

22821890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 22821890 is about 4777.2261826294. The cubic root of 22821890 is about 283.6507062645.

The spelling of 22821890 in words is "twenty-two million, eight hundred twenty-one thousand, eight hundred ninety".