28135357647 has 4 divisors (see below), whose sum is σ = 37513810200. Its totient is φ = 18756905096.

The previous prime is 28135357633. The next prime is 28135357669. The reversal of 28135357647 is 74675353182.

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 28135357647 - 2⁶ = 28135357583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28135357647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28135357687) 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, 4689226272 + ... + 4689226277.

It is an arithmetic number, because the mean of its divisors is an integer number (9378452550).

Almost surely, 2^28135357647 is an apocalyptic number.

28135357647 is a deficient number, since it is larger than the sum of its proper divisors (9378452553).

28135357647 is an equidigital number, since it uses as much as digits as its factorization.

28135357647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9378452552.

The product of its digits is 4233600, while the sum is 51.

The spelling of 28135357647 in words is "twenty-eight billion, one hundred thirty-five million, three hundred fifty-seven thousand, six hundred forty-seven".