28520129 has 8 divisors (see below), whose sum is σ = 31199520. Its totient is φ = 25855200.

The previous prime is 28520119. The next prime is 28520131. The reversal of 28520129 is 92102582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28520129 - 2⁸ = 28519873 is a prime.

It is a pancake number, because a pancake can be divided into 28520129 parts by 7552 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (28520119) 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 7 ways as a sum of consecutive naturals, for example, 749 + ... + 7589.

It is an arithmetic number, because the mean of its divisors is an integer number (3899940).

Almost surely, 2^28520129 is an apocalyptic number.

It is an amenable number.

28520129 is a deficient number, since it is larger than the sum of its proper divisors (2679391).

28520129 is a wasteful number, since it uses less digits than its factorization.

28520129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7231.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28520129 is about 5340.4240468337. The cubic root of 28520129 is about 305.5276327885.

The spelling of 28520129 in words is "twenty-eight million, five hundred twenty thousand, one hundred twenty-nine".