6442787 has 12 divisors (see below), whose sum is σ = 7093080. Its totient is φ = 5848128.

The previous prime is 6442771. The next prime is 6442801. The reversal of 6442787 is 7872446.

6442787 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6442787 - 2⁴ = 6442771 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 6442787.

It is not an unprimeable number, because it can be changed into a prime (6444787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11039 + ... + 11607.

It is an arithmetic number, because the mean of its divisors is an integer number (591090).

Almost surely, 2^6442787 is an apocalyptic number.

6442787 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

6442787 is a deficient number, since it is larger than the sum of its proper divisors (650293).

6442787 is a wasteful number, since it uses less digits than its factorization.

6442787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662 (or 649 counting only the distinct ones).

The product of its digits is 75264, while the sum is 38.

The square root of 6442787 is about 2538.2645646189. The cubic root of 6442787 is about 186.0763840125.

The spelling of 6442787 in words is "six million, four hundred forty-two thousand, seven hundred eighty-seven".