28561169 has 18 divisors (see below), whose sum is σ = 35986950. Its totient is φ = 22591296.

The previous prime is 28561153. The next prime is 28561187. The reversal of 28561169 is 96116582.

It can be written as a sum of positive squares in 3 ways, for example, as 3441025 + 25120144 = 1855^2 + 5012^2 .

It is not a de Polignac number, because 28561169 - 2⁴ = 28561153 is a prime.

It is a super-2 number, since 2×28561169² = 1631480749293122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28561069) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6557 + ... + 10005.

It is an arithmetic number, because the mean of its divisors is an integer number (1999275).

Almost surely, 2^28561169 is an apocalyptic number.

It is an amenable number.

28561169 is a deficient number, since it is larger than the sum of its proper divisors (7425781).

28561169 is a wasteful number, since it uses less digits than its factorization.

28561169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3489 (or 3469 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 28561169 is about 5344.2650570495. The cubic root of 28561169 is about 305.6741123088.

It can be divided in two parts, 28561 and 169, that multiplied together give a 6-th power (4826809 = 13⁶).

The spelling of 28561169 in words is "twenty-eight million, five hundred sixty-one thousand, one hundred sixty-nine".