6487986893 has 4 divisors (see below), whose sum is σ = 6488149500. Its totient is φ = 6487824288.

The previous prime is 6487986853. The next prime is 6487986919. The reversal of 6487986893 is 3986897846.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1888163209 + 4599823684 = 43453^2 + 67822^2 .

It is a cyclic number.

It is not a de Polignac number, because 6487986893 - 2¹⁰ = 6487985869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6487986853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24071 + ... + 116427.

It is an arithmetic number, because the mean of its divisors is an integer number (1622037375).

Almost surely, 2^6487986893 is an apocalyptic number.

It is an amenable number.

6487986893 is a deficient number, since it is larger than the sum of its proper divisors (162607).

6487986893 is an equidigital number, since it uses as much as digits as its factorization.

6487986893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162606.

The product of its digits is 125411328, while the sum is 68.

The square root of 6487986893 is about 80548.0409010672. The cubic root of 6487986893 is about 1865.1051500059.

The spelling of 6487986893 in words is "six billion, four hundred eighty-seven million, nine hundred eighty-six thousand, eight hundred ninety-three".