28157710047 has 4 divisors (see below), whose sum is σ = 37543613400. Its totient is φ = 18771806696.

The previous prime is 28157710039. The next prime is 28157710159. The reversal of 28157710047 is 74001775182.

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 28157710047 - 2³ = 28157710039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28157709990 and 28157710008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28157710027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4692951672 + ... + 4692951677.

It is an arithmetic number, because the mean of its divisors is an integer number (9385903350).

Almost surely, 2^28157710047 is an apocalyptic number.

28157710047 is a deficient number, since it is larger than the sum of its proper divisors (9385903353).

28157710047 is an equidigital number, since it uses as much as digits as its factorization.

28157710047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9385903352.

The product of its (nonzero) digits is 109760, while the sum is 42.

The spelling of 28157710047 in words is "twenty-eight billion, one hundred fifty-seven million, seven hundred ten thousand, forty-seven".