28504161 has 24 divisors (see below), whose sum is σ = 49533120. Its totient is φ = 15430176.

The previous prime is 28504111. The next prime is 28504181. The reversal of 28504161 is 16140582.

It is not a de Polignac number, because 28504161 - 2⁹ = 28503649 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28504111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10710 + ... + 13103.

It is an arithmetic number, because the mean of its divisors is an integer number (2063880).

Almost surely, 2^28504161 is an apocalyptic number.

28504161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28504161 is a deficient number, since it is larger than the sum of its proper divisors (21028959).

28504161 is a wasteful number, since it uses less digits than its factorization.

28504161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23845 (or 23842 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28504161 is about 5338.9288251484. The cubic root of 28504161 is about 305.4706020036.

The spelling of 28504161 in words is "twenty-eight million, five hundred four thousand, one hundred sixty-one".