28813839947 has 6 divisors (see below), whose sum is σ = 29613641148. Its totient is φ = 28035086184.

The previous prime is 28813839941. The next prime is 28813839953. The reversal of 28813839947 is 74993831882.

It is an interprime number because it is at equal distance from previous prime (28813839941) and next prime (28813839953).

It is not a de Polignac number, because 28813839947 - 2¹⁰ = 28813838923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28813839947.

It is not an unprimeable number, because it can be changed into a prime (28813839941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10522313 + ... + 10525050.

It is an arithmetic number, because the mean of its divisors is an integer number (4935606858).

Almost surely, 2^28813839947 is an apocalyptic number.

28813839947 is a deficient number, since it is larger than the sum of its proper divisors (799801201).

28813839947 is an equidigital number, since it uses as much as digits as its factorization.

28813839947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21047437 (or 21047400 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 62.

The spelling of 28813839947 in words is "twenty-eight billion, eight hundred thirteen million, eight hundred thirty-nine thousand, nine hundred forty-seven".