28504912123 has 2 divisors, whose sum is σ = 28504912124. Its totient is φ = 28504912122.

The previous prime is 28504912103. The next prime is 28504912157. The reversal of 28504912123 is 32121940582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28504912123 - 2²¹ = 28502814971 is a prime.

It is not a weakly prime, because it can be changed into another prime (28504912103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14252456061 + 14252456062.

It is an arithmetic number, because the mean of its divisors is an integer number (14252456062).

Almost surely, 2^28504912123 is an apocalyptic number.

28504912123 is a deficient number, since it is larger than the sum of its proper divisors (1).

28504912123 is an equidigital number, since it uses as much as digits as its factorization.

28504912123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 28504912123 in words is "twenty-eight billion, five hundred four million, nine hundred twelve thousand, one hundred twenty-three".