28691647485 has 16 divisors (see below), whose sum is σ = 45908795520. Its totient is φ = 15301492160.

The previous prime is 28691647483. The next prime is 28691647487. The reversal of 28691647485 is 58474619682.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28691647483) and next prime (28691647487).

It is not a de Polignac number, because 28691647485 - 2¹ = 28691647483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28691647483) 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 15 ways as a sum of consecutive naturals, for example, 488815 + ... + 544355.

It is an arithmetic number, because the mean of its divisors is an integer number (2869299720).

Almost surely, 2^28691647485 is an apocalyptic number.

It is an amenable number.

28691647485 is a deficient number, since it is larger than the sum of its proper divisors (17217148035).

28691647485 is a wasteful number, since it uses less digits than its factorization.

28691647485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89988.

The product of its digits is 23224320, while the sum is 60.

The spelling of 28691647485 in words is "twenty-eight billion, six hundred ninety-one million, six hundred forty-seven thousand, four hundred eighty-five".