28316129 has 4 divisors (see below), whose sum is σ = 28576020. Its totient is φ = 28056240.

The previous prime is 28316111. The next prime is 28316161. The reversal of 28316129 is 92161382.

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 8111104 + 20205025 = 2848^2 + 4495^2 .

It is a cyclic number.

It is not a de Polignac number, because 28316129 - 2⁸ = 28315873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28316095 and 28316104.

It is not an unprimeable number, because it can be changed into a prime (28316429) 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, 129782 + ... + 129999.

It is an arithmetic number, because the mean of its divisors is an integer number (7144005).

Almost surely, 2^28316129 is an apocalyptic number.

It is an amenable number.

28316129 is a deficient number, since it is larger than the sum of its proper divisors (259891).

28316129 is a wasteful number, since it uses less digits than its factorization.

28316129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259890.

The product of its digits is 5184, while the sum is 32.

The square root of 28316129 is about 5321.2901631089. The cubic root of 28316129 is about 304.7974252796.

The spelling of 28316129 in words is "twenty-eight million, three hundred sixteen thousand, one hundred twenty-nine".