6640487 has 8 divisors (see below), whose sum is σ = 7620096. Its totient is φ = 5668632.

The previous prime is 6640477. The next prime is 6640493. The reversal of 6640487 is 7840466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6640487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38 + ... + 3644.

It is an arithmetic number, because the mean of its divisors is an integer number (952512).

Almost surely, 2^6640487 is an apocalyptic number.

6640487 is a deficient number, since it is larger than the sum of its proper divisors (979609).

6640487 is a wasteful number, since it uses less digits than its factorization.

6640487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3877.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 6640487 is about 2576.9142399389. The cubic root of 6640487 is about 187.9605224940.

It can be divided in two parts, 664048 and 7, that multiplied together give a square (4648336 = 2156²).

The spelling of 6640487 in words is "six million, six hundred forty thousand, four hundred eighty-seven".