6487861 has 4 divisors (see below), whose sum is σ = 6566112. Its totient is φ = 6409612.

The previous prime is 6487849. The next prime is 6487879. The reversal of 6487861 is 1687846.

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 6487861 - 2¹⁵ = 6455093 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6487841) 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, 39001 + ... + 39166.

It is an arithmetic number, because the mean of its divisors is an integer number (1641528).

Almost surely, 2^6487861 is an apocalyptic number.

It is an amenable number.

6487861 is a deficient number, since it is larger than the sum of its proper divisors (78251).

6487861 is an equidigital number, since it uses as much as digits as its factorization.

6487861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78250.

The product of its digits is 64512, while the sum is 40.

The square root of 6487861 is about 2547.1279905022. The cubic root of 6487861 is about 186.5093086418.

The spelling of 6487861 in words is "six million, four hundred eighty-seven thousand, eight hundred sixty-one".