28565129 has 4 divisors (see below), whose sum is σ = 28593360. Its totient is φ = 28536900.

The previous prime is 28565111. The next prime is 28565137. The reversal of 28565129 is 92156582.

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 28565129 - 2¹⁶ = 28499593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28565092 and 28565101.

It is not an unprimeable number, because it can be changed into a prime (28565179) 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, 12539 + ... + 14640.

It is an arithmetic number, because the mean of its divisors is an integer number (7148340).

Almost surely, 2^28565129 is an apocalyptic number.

It is an amenable number.

28565129 is a deficient number, since it is larger than the sum of its proper divisors (28231).

28565129 is a wasteful number, since it uses less digits than its factorization.

28565129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28230.

The product of its digits is 43200, while the sum is 38.

The square root of 28565129 is about 5344.6355348143. The cubic root of 28565129 is about 305.6882388728.

The spelling of 28565129 in words is "twenty-eight million, five hundred sixty-five thousand, one hundred twenty-nine".