22287990 has 32 divisors (see below), whose sum is σ = 54141696. Its totient is φ = 5871200.

The previous prime is 22287983. The next prime is 22288001. The reversal of 22287990 is 9978222.

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 15 ways as a sum of consecutive naturals, for example, 1986 + ... + 6965.

It is an arithmetic number, because the mean of its divisors is an integer number (1691928).

Almost surely, 2^22287990 is an apocalyptic number.

22287990 is an abundant number, since it is smaller than the sum of its proper divisors (31853706).

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

22287990 is a wasteful number, since it uses less digits than its factorization.

22287990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9044.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 22287990 is about 4721.0157805286. The cubic root of 22287990 is about 281.4213020629.

The spelling of 22287990 in words is "twenty-two million, two hundred eighty-seven thousand, nine hundred ninety".