28128342563 has 8 divisors (see below), whose sum is σ = 29272531680. Its totient is φ = 26995769920.

The previous prime is 28128342547. The next prime is 28128342581. The reversal of 28128342563 is 36524382182.

It is a happy number.

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 28128342563 - 2⁴ = 28128342547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28128342533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2899178 + ... + 2908863.

It is an arithmetic number, because the mean of its divisors is an integer number (3659066460).

Almost surely, 2^28128342563 is an apocalyptic number.

28128342563 is a deficient number, since it is larger than the sum of its proper divisors (1144189117).

28128342563 is a wasteful number, since it uses less digits than its factorization.

28128342563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5808237.

The product of its digits is 552960, while the sum is 44.

The spelling of 28128342563 in words is "twenty-eight billion, one hundred twenty-eight million, three hundred forty-two thousand, five hundred sixty-three".