28504129 has 8 divisors (see below), whose sum is σ = 29793960. Its totient is φ = 27234816.

The previous prime is 28504111. The next prime is 28504181. The reversal of 28504129 is 92140582.

It can be written as a sum of positive squares in 4 ways, for example, as 7573504 + 20930625 = 2752^2 + 4575^2 .

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 28504129 - 2⁷ = 28504001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28504129.

It is not an unprimeable number, because it can be changed into a prime (28544129) 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 7 ways as a sum of consecutive naturals, for example, 2254 + ... + 7879.

It is an arithmetic number, because the mean of its divisors is an integer number (3724245).

Almost surely, 2^28504129 is an apocalyptic number.

28504129 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28504129 is a deficient number, since it is larger than the sum of its proper divisors (1289831).

28504129 is a wasteful number, since it uses less digits than its factorization.

28504129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10259.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 28504129 is about 5338.9258282917. The cubic root of 28504129 is about 305.4704876921.

The spelling of 28504129 in words is "twenty-eight million, five hundred four thousand, one hundred twenty-nine".