28115689 has 8 divisors (see below), whose sum is σ = 32194368. Its totient is φ = 24052560.

The previous prime is 28115629. The next prime is 28115699. The reversal of 28115689 is 98651182.

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

It is not a de Polignac number, because 28115689 - 2⁷ = 28115561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28115629) 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, 294 + ... + 7504.

It is an arithmetic number, because the mean of its divisors is an integer number (4024296).

Almost surely, 2^28115689 is an apocalyptic number.

It is an amenable number.

28115689 is a deficient number, since it is larger than the sum of its proper divisors (4078679).

28115689 is an equidigital number, since it uses as much as digits as its factorization.

28115689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7775.

The product of its digits is 34560, while the sum is 40.

The square root of 28115689 is about 5302.4229367337. The cubic root of 28115689 is about 304.0765367367.

The spelling of 28115689 in words is "twenty-eight million, one hundred fifteen thousand, six hundred eighty-nine".