28860643485 has 12 divisors (see below), whose sum is σ = 50025115452. Its totient is φ = 15392343168.

The previous prime is 28860643433. The next prime is 28860643507. The reversal of 28860643485 is 58434606882.

28860643485 is a `hidden beast` number, since 28 + 8 + 606 + 4 + 3 + 4 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12144480804 + 16716162681 = 110202^2 + 129291^2 .

It is not a de Polignac number, because 28860643485 - 2¹¹ = 28860641437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 320673772 + ... + 320673861.

It is an arithmetic number, because the mean of its divisors is an integer number (4168759621).

Almost surely, 2^28860643485 is an apocalyptic number.

It is an amenable number.

28860643485 is a deficient number, since it is larger than the sum of its proper divisors (21164471967).

28860643485 is a wasteful number, since it uses less digits than its factorization.

28860643485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641347644 (or 641347641 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 54.

The spelling of 28860643485 in words is "twenty-eight billion, eight hundred sixty million, six hundred forty-three thousand, four hundred eighty-five".