6347643987 has 8 divisors (see below), whose sum is σ = 8464193536. Its totient is φ = 4231428552.

The previous prime is 6347643943. The next prime is 6347643997. The reversal of 6347643987 is 7893467436.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6347643987 - 2¹⁰ = 6347642963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6347643997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35203 + ... + 118044.

It is an arithmetic number, because the mean of its divisors is an integer number (1058024192).

Almost surely, 2^6347643987 is an apocalyptic number.

6347643987 is a deficient number, since it is larger than the sum of its proper divisors (2116549549).

6347643987 is a wasteful number, since it uses less digits than its factorization.

6347643987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167057.

The product of its digits is 18289152, while the sum is 57.

The square root of 6347643987 is about 79672.1029407408. The cubic root of 6347643987 is about 1851.5588504145.

The spelling of 6347643987 in words is "six billion, three hundred forty-seven million, six hundred forty-three thousand, nine hundred eighty-seven".