28840478867 has 4 divisors (see below), whose sum is σ = 29187954600. Its totient is φ = 28493003136.

The previous prime is 28840478819. The next prime is 28840478893. The reversal of 28840478867 is 76887404882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76887404882 = 2 ⋅38443702441.

It is a cyclic number.

It is not a de Polignac number, because 28840478867 - 2¹² = 28840474771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28840478897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173737742 + ... + 173737907.

It is an arithmetic number, because the mean of its divisors is an integer number (7296988650).

Almost surely, 2^28840478867 is an apocalyptic number.

28840478867 is a deficient number, since it is larger than the sum of its proper divisors (347475733).

28840478867 is an equidigital number, since it uses as much as digits as its factorization.

28840478867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347475732.

The product of its (nonzero) digits is 38535168, while the sum is 62.

The spelling of 28840478867 in words is "twenty-eight billion, eight hundred forty million, four hundred seventy-eight thousand, eight hundred sixty-seven".