28521129 has 16 divisors (see below), whose sum is σ = 46804352. Its totient is φ = 15043968.

The previous prime is 28521107. The next prime is 28521137. The reversal of 28521129 is 92112582.

It is not a de Polignac number, because 28521129 - 2⁷ = 28521001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28521096 and 28521105.

It is not an unprimeable number, because it can be changed into a prime (28521139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51964 + ... + 52509.

It is an arithmetic number, because the mean of its divisors is an integer number (2925272).

Almost surely, 2^28521129 is an apocalyptic number.

It is an amenable number.

28521129 is a deficient number, since it is larger than the sum of its proper divisors (18283223).

28521129 is a wasteful number, since it uses less digits than its factorization.

28521129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104496.

The product of its digits is 2880, while the sum is 30.

The square root of 28521129 is about 5340.5176715371. The cubic root of 28521129 is about 305.5312036473.

The spelling of 28521129 in words is "twenty-eight million, five hundred twenty-one thousand, one hundred twenty-nine".