6439497687 has 12 divisors (see below), whose sum is σ = 10630282000. Its totient is φ = 3679712928.

The previous prime is 6439497667. The next prime is 6439497707. The reversal of 6439497687 is 7867949346.

6439497687 is a `hidden beast` number, since 64 + 3 + 9 + 497 + 6 + 87 = 666.

It is an interprime number because it is at equal distance from previous prime (6439497667) and next prime (6439497707).

It is not a de Polignac number, because 6439497687 - 2⁸ = 6439497431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 102214249 = 6439497687 / (6 + 4 + 3 + 9 + 4 + 9 + 7 + 6 + 8 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439497667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51107062 + ... + 51107187.

Almost surely, 2^6439497687 is an apocalyptic number.

6439497687 is a deficient number, since it is larger than the sum of its proper divisors (4190784313).

6439497687 is a wasteful number, since it uses less digits than its factorization.

6439497687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102214262 (or 102214259 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 63.

The square root of 6439497687 is about 80246.4808387259. The cubic root of 6439497687 is about 1860.4471202236.

The spelling of 6439497687 in words is "six billion, four hundred thirty-nine million, four hundred ninety-seven thousand, six hundred eighty-seven".