28931169 has 4 divisors (see below), whose sum is σ = 38574896. Its totient is φ = 19287444.

The previous prime is 28931099. The next prime is 28931191. The reversal of 28931169 is 96113982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28931169 - 2⁷ = 28931041 is a prime.

It is a super-2 number, since 2×28931169² = 1674025079413122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28931369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4821859 + ... + 4821864.

It is an arithmetic number, because the mean of its divisors is an integer number (9643724).

Almost surely, 2^28931169 is an apocalyptic number.

It is an amenable number.

28931169 is a deficient number, since it is larger than the sum of its proper divisors (9643727).

28931169 is an equidigital number, since it uses as much as digits as its factorization.

28931169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9643726.

The product of its digits is 23328, while the sum is 39.

The square root of 28931169 is about 5378.7702126044. The cubic root of 28931169 is about 306.9884203069.

The spelling of 28931169 in words is "twenty-eight million, nine hundred thirty-one thousand, one hundred sixty-nine".