6642587 has 12 divisors (see below), whose sum is σ = 7978176. Its totient is φ = 5508720.

The previous prime is 6642553. The next prime is 6642593. The reversal of 6642587 is 7852466.

It is a happy number.

It is not a de Polignac number, because 6642587 - 2⁶ = 6642523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6642587.

It is not an unprimeable number, because it can be changed into a prime (6642187) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 668 + ... + 3705.

It is an arithmetic number, because the mean of its divisors is an integer number (664848).

Almost surely, 2^6642587 is an apocalyptic number.

6642587 is a deficient number, since it is larger than the sum of its proper divisors (1335589).

6642587 is a wasteful number, since it uses less digits than its factorization.

6642587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4418 (or 4411 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 6642587 is about 2577.3216718136. The cubic root of 6642587 is about 187.9803340678.

The spelling of 6642587 in words is "six million, six hundred forty-two thousand, five hundred eighty-seven".