28556347867 has 4 divisors (see below), whose sum is σ = 28560263256. Its totient is φ = 28552432480.

The previous prime is 28556347829. The next prime is 28556347871. The reversal of 28556347867 is 76874365582.

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

It is a cyclic number.

It is not a de Polignac number, because 28556347867 - 2¹⁹ = 28555823579 is a prime.

It is a super-2 number, since 2×28556347867² (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 (28556347877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1946734 + ... + 1961347.

It is an arithmetic number, because the mean of its divisors is an integer number (7140065814).

Almost surely, 2^28556347867 is an apocalyptic number.

28556347867 is a deficient number, since it is larger than the sum of its proper divisors (3915389).

28556347867 is an equidigital number, since it uses as much as digits as its factorization.

28556347867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3915388.

The product of its digits is 67737600, while the sum is 61.

The spelling of 28556347867 in words is "twenty-eight billion, five hundred fifty-six million, three hundred forty-seven thousand, eight hundred sixty-seven".