28504912129 has 8 divisors (see below), whose sum is σ = 30419324928. Its totient is φ = 26616905280.

The previous prime is 28504912123. The next prime is 28504912157. The reversal of 28504912129 is 92121940582.

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 28504912129 - 2⁷ = 28504912001 is a prime.

It is a super-2 number, since 2×28504912129² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28504912123) 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, 6599257 + ... + 6603574.

It is an arithmetic number, because the mean of its divisors is an integer number (3802415616).

Almost surely, 2^28504912129 is an apocalyptic number.

It is an amenable number.

28504912129 is a deficient number, since it is larger than the sum of its proper divisors (1914412799).

28504912129 is a wasteful number, since it uses less digits than its factorization.

28504912129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13202975.

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 28504912129 in words is "twenty-eight billion, five hundred four million, nine hundred twelve thousand, one hundred twenty-nine".