28643239747 has 8 divisors (see below), whose sum is σ = 29279902400. Its totient is φ = 28012728744.

The previous prime is 28643239741. The next prime is 28643239759. The reversal of 28643239747 is 74793234682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28643239747 - 2⁷ = 28643239619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28643239741) 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 7 ways as a sum of consecutive naturals, for example, 1528497 + ... + 1547122.

It is an arithmetic number, because the mean of its divisors is an integer number (3659987800).

Almost surely, 2^28643239747 is an apocalyptic number.

28643239747 is a deficient number, since it is larger than the sum of its proper divisors (636662653).

28643239747 is a wasteful number, since it uses less digits than its factorization.

28643239747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3075825.

The product of its digits is 12192768, while the sum is 55.

The spelling of 28643239747 in words is "twenty-eight billion, six hundred forty-three million, two hundred thirty-nine thousand, seven hundred forty-seven".