28663327247 has 4 divisors (see below), whose sum is σ = 28669388040. Its totient is φ = 28657266456.

The previous prime is 28663327177. The next prime is 28663327261. The reversal of 28663327247 is 74272336682.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28663327247 is a prime.

It is a super-2 number, since 2×28663327247² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28663327195 and 28663327204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28663327747) 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, 3023297 + ... + 3032762.

It is an arithmetic number, because the mean of its divisors is an integer number (7167347010).

Almost surely, 2^28663327247 is an apocalyptic number.

28663327247 is a deficient number, since it is larger than the sum of its proper divisors (6060793).

28663327247 is an equidigital number, since it uses as much as digits as its factorization.

28663327247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6060792.

The product of its digits is 4064256, while the sum is 50.

The spelling of 28663327247 in words is "twenty-eight billion, six hundred sixty-three million, three hundred twenty-seven thousand, two hundred forty-seven".