28572169 has 4 divisors (see below), whose sum is σ = 28916496. Its totient is φ = 28227844.

The previous prime is 28572157. The next prime is 28572191. The reversal of 28572169 is 96127582.

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 a cyclic number.

It is not a de Polignac number, because 28572169 - 2⁹ = 28571657 is a prime.

It is a super-2 number, since 2×28572169² = 1632737682729122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28572109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172039 + ... + 172204.

It is an arithmetic number, because the mean of its divisors is an integer number (7229124).

Almost surely, 2^28572169 is an apocalyptic number.

It is an amenable number.

28572169 is a deficient number, since it is larger than the sum of its proper divisors (344327).

28572169 is an equidigital number, since it uses as much as digits as its factorization.

28572169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344326.

The product of its digits is 60480, while the sum is 40.

The square root of 28572169 is about 5345.2940985506. The cubic root of 28572169 is about 305.7133495411.

The spelling of 28572169 in words is "twenty-eight million, five hundred seventy-two thousand, one hundred sixty-nine".