6479987 has 4 divisors (see below), whose sum is σ = 6499896. Its totient is φ = 6460080.

The previous prime is 6479959. The next prime is 6479989. The reversal of 6479987 is 7899746.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6479987 - 2⁶ = 6479923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6479989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9458 + ... + 10119.

It is an arithmetic number, because the mean of its divisors is an integer number (1624974).

Almost surely, 2^6479987 is an apocalyptic number.

6479987 is a deficient number, since it is larger than the sum of its proper divisors (19909).

6479987 is a wasteful number, since it uses less digits than its factorization.

6479987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19908.

The product of its digits is 762048, while the sum is 50.

The square root of 6479987 is about 2545.5818588291. The cubic root of 6479987 is about 186.4338256842.

The spelling of 6479987 in words is "six million, four hundred seventy-nine thousand, nine hundred eighty-seven".