28504208629129 has 4 divisors (see below), whose sum is σ = 28504685085076. Its totient is φ = 28503732173184.

The previous prime is 28504208629123. The next prime is 28504208629177. The reversal of 28504208629129 is 92192680240582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22012658815225 + 6491549813904 = 4691765^2 + 2547852^2 .

It is a cyclic number.

It is not a de Polignac number, because 28504208629129 - 2²⁷ = 28504074411401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28504208629123) 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, 238138224 + ... + 238257889.

It is an arithmetic number, because the mean of its divisors is an integer number (7126171271269).

Almost surely, 2^{28504208629129} is an apocalyptic number.

It is an amenable number.

28504208629129 is a deficient number, since it is larger than the sum of its proper divisors (476455947).

28504208629129 is an equidigital number, since it uses as much as digits as its factorization.

28504208629129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476455946.

The product of its (nonzero) digits is 9953280, while the sum is 58.

The spelling of 28504208629129 in words is "twenty-eight trillion, five hundred four billion, two hundred eight million, six hundred twenty-nine thousand, one hundred twenty-nine".