28200129 has 4 divisors (see below), whose sum is σ = 37600176. Its totient is φ = 18800084.

The previous prime is 28200113. The next prime is 28200143. The reversal of 28200129 is 92100282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28200129 - 2⁴ = 28200113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28200099 and 28200108.

It is not an unprimeable number, because it can be changed into a prime (28200149) 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, 4700019 + ... + 4700024.

It is an arithmetic number, because the mean of its divisors is an integer number (9400044).

Almost surely, 2^28200129 is an apocalyptic number.

It is an amenable number.

28200129 is a deficient number, since it is larger than the sum of its proper divisors (9400047).

28200129 is an equidigital number, since it uses as much as digits as its factorization.

28200129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9400046.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 28200129 is about 5310.3793649795. The cubic root of 28200129 is about 304.3806440633.

The spelling of 28200129 in words is "twenty-eight million, two hundred thousand, one hundred twenty-nine".