28687169 has 8 divisors (see below), whose sum is σ = 34511040. Its totient is φ = 23294736.

The previous prime is 28687163. The next prime is 28687199. The reversal of 28687169 is 96178682.

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 28687169 - 2⁸ = 28686913 is a prime.

It is a super-2 number, since 2×28687169² = 1645907330469122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28687163) 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, 107714 + ... + 107979.

It is an arithmetic number, because the mean of its divisors is an integer number (4313880).

Almost surely, 2^28687169 is an apocalyptic number.

It is an amenable number.

28687169 is a deficient number, since it is larger than the sum of its proper divisors (5823871).

28687169 is a wasteful number, since it uses less digits than its factorization.

28687169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215719.

The product of its digits is 290304, while the sum is 47.

The square root of 28687169 is about 5356.0404218042. The cubic root of 28687169 is about 306.1229552730.

The spelling of 28687169 in words is "twenty-eight million, six hundred eighty-seven thousand, one hundred sixty-nine".