28781447863 has 6 divisors (see below), whose sum is σ = 33480459816. Its totient is φ = 24669812412.

The previous prime is 28781447839. The next prime is 28781447881. The reversal of 28781447863 is 36874418782.

It is not a de Polignac number, because 28781447863 - 2⁹ = 28781447351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28781447798 and 28781447807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28781447803) 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 5 ways as a sum of consecutive naturals, for example, 293688195 + ... + 293688292.

It is an arithmetic number, because the mean of its divisors is an integer number (5580076636).

Almost surely, 2^28781447863 is an apocalyptic number.

28781447863 is a deficient number, since it is larger than the sum of its proper divisors (4699011953).

28781447863 is an equidigital number, since it uses as much as digits as its factorization.

28781447863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587376501 (or 587376494 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 58.

The spelling of 28781447863 in words is "twenty-eight billion, seven hundred eighty-one million, four hundred forty-seven thousand, eight hundred sixty-three".