6491427987 has 8 divisors (see below), whose sum is σ = 9442077120. Its totient is φ = 3934198760.

The previous prime is 6491427979. The next prime is 6491427997. The reversal of 6491427987 is 7897241946.

It is a happy number.

6491427987 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 6491427987 - 2³ = 6491427979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6491427907) 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, 98354937 + ... + 98355002.

It is an arithmetic number, because the mean of its divisors is an integer number (1180259640).

Almost surely, 2^6491427987 is an apocalyptic number.

6491427987 is a deficient number, since it is larger than the sum of its proper divisors (2950649133).

6491427987 is a wasteful number, since it uses less digits than its factorization.

6491427987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196709953.

The product of its digits is 6096384, while the sum is 57.

The square root of 6491427987 is about 80569.3985766308. The cubic root of 6491427987 is about 1865.4348294541.

The spelling of 6491427987 in words is "six billion, four hundred ninety-one million, four hundred twenty-seven thousand, nine hundred eighty-seven".