28947987535 has 4 divisors (see below), whose sum is σ = 34737585048. Its totient is φ = 23158390024.

The previous prime is 28947987521. The next prime is 28947987539. The reversal of 28947987535 is 53578974982.

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 28947987535 - 2⁷ = 28947987407 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28947987539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2894798749 + ... + 2894798758.

It is an arithmetic number, because the mean of its divisors is an integer number (8684396262).

Almost surely, 2^28947987535 is an apocalyptic number.

28947987535 is a deficient number, since it is larger than the sum of its proper divisors (5789597513).

28947987535 is an equidigital number, since it uses as much as digits as its factorization.

28947987535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5789597512.

The product of its digits is 152409600, while the sum is 67.

The spelling of 28947987535 in words is "twenty-eight billion, nine hundred forty-seven million, nine hundred eighty-seven thousand, five hundred thirty-five".