6645487 has 8 divisors (see below), whose sum is σ = 7063632. Its totient is φ = 6230400.

The previous prime is 6645479. The next prime is 6645491. The reversal of 6645487 is 7845466.

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 6645487 - 2³ = 6645479 is a prime.

It is an Ulam 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 (6645467) 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, 5037 + ... + 6217.

It is an arithmetic number, because the mean of its divisors is an integer number (882954).

Almost surely, 2^6645487 is an apocalyptic number.

6645487 is a deficient number, since it is larger than the sum of its proper divisors (418145).

6645487 is a wasteful number, since it uses less digits than its factorization.

6645487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529.

The product of its digits is 161280, while the sum is 40.

The square root of 6645487 is about 2577.8842099675. The cubic root of 6645487 is about 188.0076860446.

The spelling of 6645487 in words is "six million, six hundred forty-five thousand, four hundred eighty-seven".