22281768 has 24 divisors (see below), whose sum is σ = 60346650. Its totient is φ = 7427232.

The previous prime is 22281767. The next prime is 22281793. The reversal of 22281768 is 86718222.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12659364 + 9622404 = 3558^2 + 3102^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (22281761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154663 + ... + 154806.

Almost surely, 2^22281768 is an apocalyptic number.

It is an amenable number.

22281768 is an abundant number, since it is smaller than the sum of its proper divisors (38064882).

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

22281768 is a wasteful number, since it uses less digits than its factorization.

22281768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309481 (or 309474 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 22281768 is about 4720.3567661777. The cubic root of 22281768 is about 281.3951120789.

The spelling of 22281768 in words is "twenty-two million, two hundred eighty-one thousand, seven hundred sixty-eight".