28085129 has 4 divisors (see below), whose sum is σ = 28202880. Its totient is φ = 27967380.

The previous prime is 28085119. The next prime is 28085153. The reversal of 28085129 is 92158082.

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 28085129 - 2⁸ = 28084873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28085119) 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, 58517 + ... + 58994.

It is an arithmetic number, because the mean of its divisors is an integer number (7050720).

Almost surely, 2^28085129 is an apocalyptic number.

It is an amenable number.

28085129 is a deficient number, since it is larger than the sum of its proper divisors (117751).

28085129 is a wasteful number, since it uses less digits than its factorization.

28085129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117750.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 28085129 is about 5299.5404517750. The cubic root of 28085129 is about 303.9663260543.

The spelling of 28085129 in words is "twenty-eight million, eighty-five thousand, one hundred twenty-nine".