28672427643 has 4 divisors (see below), whose sum is σ = 38229903528. Its totient is φ = 19114951760.

The previous prime is 28672427621. The next prime is 28672427657. The reversal of 28672427643 is 34672427682.

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 28672427643 - 2¹⁷ = 28672296571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28672427683) 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, 4778737938 + ... + 4778737943.

It is an arithmetic number, because the mean of its divisors is an integer number (9557475882).

Almost surely, 2^28672427643 is an apocalyptic number.

28672427643 is a deficient number, since it is larger than the sum of its proper divisors (9557475885).

28672427643 is an equidigital number, since it uses as much as digits as its factorization.

28672427643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9557475884.

The product of its digits is 5419008, while the sum is 51.

The spelling of 28672427643 in words is "twenty-eight billion, six hundred seventy-two million, four hundred twenty-seven thousand, six hundred forty-three".