28160109 has 32 divisors (see below), whose sum is σ = 46512000. Its totient is φ = 16733952.

The previous prime is 28160081. The next prime is 28160129. The reversal of 28160109 is 90106182.

It is not a de Polignac number, because 28160109 - 2⁹ = 28159597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28160129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7107 + ... + 10335.

It is an arithmetic number, because the mean of its divisors is an integer number (1453500).

Almost surely, 2^28160109 is an apocalyptic number.

It is an amenable number.

28160109 is a deficient number, since it is larger than the sum of its proper divisors (18351891).

28160109 is a wasteful number, since it uses less digits than its factorization.

28160109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3274 (or 3268 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 28160109 is about 5306.6099347889. The cubic root of 28160109 is about 304.2365894000.

The spelling of 28160109 in words is "twenty-eight million, one hundred sixty thousand, one hundred nine".