28911169 has 16 divisors (see below), whose sum is σ = 35278848. Its totient is φ = 23127552.

The previous prime is 28911137. The next prime is 28911187. The reversal of 28911169 is 96111982.

It is not a de Polignac number, because 28911169 - 2⁵ = 28911137 is a prime.

It is a super-2 number, since 2×28911169² = 1671711385893122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28911119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14157 + ... + 16069.

It is an arithmetic number, because the mean of its divisors is an integer number (2204928).

Almost surely, 2^28911169 is an apocalyptic number.

It is an amenable number.

28911169 is a deficient number, since it is larger than the sum of its proper divisors (6367679).

28911169 is a wasteful number, since it uses less digits than its factorization.

28911169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064.

The product of its digits is 7776, while the sum is 37.

The square root of 28911169 is about 5376.9107301498. The cubic root of 28911169 is about 306.9176640492.

It can be divided in two parts, 289111 and 69, that added together give a triangular number (289180 = T₇₆₀).

The spelling of 28911169 in words is "twenty-eight million, nine hundred eleven thousand, one hundred sixty-nine".