28439169 has 16 divisors (see below), whose sum is σ = 42793920. Its totient is φ = 16640960.

The previous prime is 28439161. The next prime is 28439179. The reversal of 28439169 is 96193482.

It is a cyclic number.

It is not a de Polignac number, because 28439169 - 2³ = 28439161 is a prime.

It is a super-2 number, since 2×28439169² = 1617572666821122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 28439169.

It is not an unprimeable number, because it can be changed into a prime (28439161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13902 + ... + 15815.

It is an arithmetic number, because the mean of its divisors is an integer number (2674620).

Almost surely, 2^28439169 is an apocalyptic number.

28439169 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28439169 is a deficient number, since it is larger than the sum of its proper divisors (14354751).

28439169 is a wasteful number, since it uses less digits than its factorization.

28439169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29760.

The product of its digits is 93312, while the sum is 42.

The square root of 28439169 is about 5332.8387374831. The cubic root of 28439169 is about 305.2382586920.

The spelling of 28439169 in words is "twenty-eight million, four hundred thirty-nine thousand, one hundred sixty-nine".