28381161 has 8 divisors (see below), whose sum is σ = 38721760. Its totient is φ = 18480672.

The previous prime is 28381147. The next prime is 28381163. The reversal of 28381161 is 16118382.

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

It is not a de Polignac number, because 28381161 - 2⁶ = 28381097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28381163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109876 + ... + 110133.

It is an arithmetic number, because the mean of its divisors is an integer number (4840220).

Almost surely, 2^28381161 is an apocalyptic number.

It is an amenable number.

28381161 is a deficient number, since it is larger than the sum of its proper divisors (10340599).

28381161 is a wasteful number, since it uses less digits than its factorization.

28381161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220055.

The product of its digits is 2304, while the sum is 30.

The square root of 28381161 is about 5327.3972068919. The cubic root of 28381161 is about 305.0305836930.

The spelling of 28381161 in words is "twenty-eight million, three hundred eighty-one thousand, one hundred sixty-one".