28508161 has 8 divisors (see below), whose sum is σ = 31858848. Its totient is φ = 25284000.

The previous prime is 28508153. The next prime is 28508171. The reversal of 28508161 is 16180582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28508161 - 2³ = 28508153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28508101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31155 + ... + 32056.

It is an arithmetic number, because the mean of its divisors is an integer number (3982356).

It is a Proth number, since it is equal to 435 ⋅ 2¹⁶ + 1 and 435 < 2¹⁶.

Almost surely, 2^28508161 is an apocalyptic number.

It is an amenable number.

28508161 is a deficient number, since it is larger than the sum of its proper divisors (3350687).

28508161 is a wasteful number, since it uses less digits than its factorization.

28508161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63263.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 28508161 is about 5339.3034189864. The cubic root of 28508161 is about 305.4848902714.

It can be divided in two parts, 2850 and 8161, that added together give a palindrome (11011).

The spelling of 28508161 in words is "twenty-eight million, five hundred eight thousand, one hundred sixty-one".