28057743847 has 4 divisors (see below), whose sum is σ = 32065992976. Its totient is φ = 24049494720.

The previous prime is 28057743839. The next prime is 28057743851. The reversal of 28057743847 is 74834775082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74834775082 = 2 ⋅37417387541.

It is a cyclic number.

It is not a de Polignac number, because 28057743847 - 2³ = 28057743839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057743047) 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, 2004124554 + ... + 2004124567.

It is an arithmetic number, because the mean of its divisors is an integer number (8016498244).

Almost surely, 2^28057743847 is an apocalyptic number.

28057743847 is a deficient number, since it is larger than the sum of its proper divisors (4008249129).

28057743847 is an equidigital number, since it uses as much as digits as its factorization.

28057743847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008249128.

The product of its (nonzero) digits is 10536960, while the sum is 55.

The spelling of 28057743847 in words is "twenty-eight billion, fifty-seven million, seven hundred forty-three thousand, eight hundred forty-seven".