28226689 has 8 divisors (see below), whose sum is σ = 28797120. Its totient is φ = 27661200.

The previous prime is 28226663. The next prime is 28226699. The reversal of 28226689 is 98662282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28226689 - 2²³ = 19838081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28226699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11599 + ... + 13819.

It is an arithmetic number, because the mean of its divisors is an integer number (3599640).

Almost surely, 2^28226689 is an apocalyptic number.

It is an amenable number.

28226689 is a deficient number, since it is larger than the sum of its proper divisors (570431).

28226689 is a wasteful number, since it uses less digits than its factorization.

28226689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471.

The product of its digits is 165888, while the sum is 43.

The square root of 28226689 is about 5312.8795393835. The cubic root of 28226689 is about 304.4761733329.

The spelling of 28226689 in words is "twenty-eight million, two hundred twenty-six thousand, six hundred eighty-nine".