6640877 has 4 divisors (see below), whose sum is σ = 6795360. Its totient is φ = 6486396.

The previous prime is 6640849. The next prime is 6640889. The reversal of 6640877 is 7780466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6640877 - 2¹² = 6636781 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 6640877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640807) 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 3 ways as a sum of consecutive naturals, for example, 77177 + ... + 77262.

It is an arithmetic number, because the mean of its divisors is an integer number (1698840).

Almost surely, 2^6640877 is an apocalyptic number.

It is an amenable number.

6640877 is a deficient number, since it is larger than the sum of its proper divisors (154483).

6640877 is a wasteful number, since it uses less digits than its factorization.

6640877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154482.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 6640877 is about 2576.9899107292. The cubic root of 6640877 is about 187.9642021021.

The spelling of 6640877 in words is "six million, six hundred forty thousand, eight hundred seventy-seven".