28356129 has 16 divisors (see below), whose sum is σ = 42335040. Its totient is φ = 18757440.

The previous prime is 28356127. The next prime is 28356131. The reversal of 28356129 is 92165382.

28356129 is a `hidden beast` number, since 2 + 8 + 35 + 612 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (28356127) and next prime (28356131).

It is not a de Polignac number, because 28356129 - 2¹ = 28356127 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28356093 and 28356102.

It is not an unprimeable number, because it can be changed into a prime (28356127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472 + ... + 7545.

It is an arithmetic number, because the mean of its divisors is an integer number (2645940).

Almost surely, 2^28356129 is an apocalyptic number.

It is an amenable number.

28356129 is a deficient number, since it is larger than the sum of its proper divisors (13978911).

28356129 is a wasteful number, since it uses less digits than its factorization.

28356129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8157 (or 8151 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28356129 is about 5325.0473237334. The cubic root of 28356129 is about 304.9408789824.

The spelling of 28356129 in words is "twenty-eight million, three hundred fifty-six thousand, one hundred twenty-nine".