6642807 has 4 divisors (see below), whose sum is σ = 8857080. Its totient is φ = 4428536.

The previous prime is 6642803. The next prime is 6642817. The reversal of 6642807 is 7082466.

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 6642807 - 2² = 6642803 is a prime.

It is a D-number.

6642807 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642803) 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, 1107132 + ... + 1107137.

It is an arithmetic number, because the mean of its divisors is an integer number (2214270).

Almost surely, 2^6642807 is an apocalyptic number.

6642807 is a deficient number, since it is larger than the sum of its proper divisors (2214273).

6642807 is a wasteful number, since it uses less digits than its factorization.

6642807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2214272.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 6642807 is about 2577.3643514257. The cubic root of 6642807 is about 187.9824093244.

The spelling of 6642807 in words is "six million, six hundred forty-two thousand, eight hundred seven".