28550161 has 4 divisors (see below), whose sum is σ = 28613092. Its totient is φ = 28487232.

The previous prime is 28550099. The next prime is 28550201. The reversal of 28550161 is 16105582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20250000 + 8300161 = 4500^2 + 2881^2 .

It is a cyclic number.

It is not a de Polignac number, because 28550161 - 2²³ = 20161553 is a prime.

It is a super-2 number, since 2×28550161² = 1630223386251842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28556161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30780 + ... + 31693.

It is an arithmetic number, because the mean of its divisors is an integer number (7153273).

Almost surely, 2^28550161 is an apocalyptic number.

It is an amenable number.

28550161 is a deficient number, since it is larger than the sum of its proper divisors (62931).

28550161 is an equidigital number, since it uses as much as digits as its factorization.

28550161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62930.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 28550161 is about 5343.2350687575. The cubic root of 28550161 is about 305.6348364536.

The spelling of 28550161 in words is "twenty-eight million, five hundred fifty thousand, one hundred sixty-one".