6487938649 has 4 divisors (see below), whose sum is σ = 6494043136. Its totient is φ = 6481834164.

The previous prime is 6487938623. The next prime is 6487938659. The reversal of 6487938649 is 9468397846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6487938649 - 2⁷ = 6487938521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6487938659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3050649 + ... + 3052774.

It is an arithmetic number, because the mean of its divisors is an integer number (1623510784).

Almost surely, 2^6487938649 is an apocalyptic number.

It is an amenable number.

6487938649 is a deficient number, since it is larger than the sum of its proper divisors (6104487).

6487938649 is a wasteful number, since it uses less digits than its factorization.

6487938649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6104486.

The product of its digits is 62705664, while the sum is 64.

The square root of 6487938649 is about 80547.7414270568. The cubic root of 6487938649 is about 1865.1005270847.

The spelling of 6487938649 in words is "six billion, four hundred eighty-seven million, nine hundred thirty-eight thousand, six hundred forty-nine".