28809922 has 4 divisors (see below), whose sum is σ = 43214886. Its totient is φ = 14404960.

The previous prime is 28809901. The next prime is 28809929. The reversal of 28809922 is 22990882.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 24611521 + 4198401 = 4961^2 + 2049^2 .

It is not an unprimeable number, because it can be changed into a prime (28809929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7202479 + ... + 7202482.

Almost surely, 2^28809922 is an apocalyptic number.

28809922 is a deficient number, since it is larger than the sum of its proper divisors (14404964).

28809922 is a wasteful number, since it uses less digits than its factorization.

28809922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14404963.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 28809922 is about 5367.4874941634. The cubic root of 28809922 is about 306.5589694815.

The spelling of 28809922 in words is "twenty-eight million, eight hundred nine thousand, nine hundred twenty-two".