28160161 has 4 divisors (see below), whose sum is σ = 28315924. Its totient is φ = 28004400.

The previous prime is 28160137. The next prime is 28160173. The reversal of 28160161 is 16106182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16106182 = 2 ⋅8053091.

It can be written as a sum of positive squares in 2 ways, for example, as 11350161 + 16810000 = 3369^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 28160161 - 2⁵ = 28160129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28100161) 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, 77610 + ... + 77971.

It is an arithmetic number, because the mean of its divisors is an integer number (7078981).

Almost surely, 2^28160161 is an apocalyptic number.

It is an amenable number.

28160161 is a deficient number, since it is larger than the sum of its proper divisors (155763).

28160161 is a wasteful number, since it uses less digits than its factorization.

28160161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155762.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 28160161 is about 5306.6148343365. The cubic root of 28160161 is about 304.2367766660.

The spelling of 28160161 in words is "twenty-eight million, one hundred sixty thousand, one hundred sixty-one".