28523169 has 12 divisors (see below), whose sum is σ = 41978196. Its totient is φ = 18656352.

The previous prime is 28523119. The next prime is 28523177. The reversal of 28523169 is 96132582.

It can be written as a sum of positive squares in 2 ways, for example, as 20142144 + 8381025 = 4488^2 + 2895^2 .

It is not a de Polignac number, because 28523169 - 2¹⁶ = 28457633 is a prime.

It is a super-2 number, since 2×28523169² = 1627142339605122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28523119) 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 11 ways as a sum of consecutive naturals, for example, 29422 + ... + 30375.

It is an arithmetic number, because the mean of its divisors is an integer number (3498183).

Almost surely, 2^28523169 is an apocalyptic number.

It is an amenable number.

28523169 is a deficient number, since it is larger than the sum of its proper divisors (13455027).

28523169 is a wasteful number, since it uses less digits than its factorization.

28523169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59856 (or 59853 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28523169 is about 5340.7086608427. The cubic root of 28523169 is about 305.5384879404.

The spelling of 28523169 in words is "twenty-eight million, five hundred twenty-three thousand, one hundred sixty-nine".