6640862 has 4 divisors (see below), whose sum is σ = 9961296. Its totient is φ = 3320430.

The previous prime is 6640849. The next prime is 6640889. The reversal of 6640862 is 2680466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1660214 + ... + 1660217.

It is an arithmetic number, because the mean of its divisors is an integer number (2490324).

Almost surely, 2^6640862 is an apocalyptic number.

6640862 is a deficient number, since it is larger than the sum of its proper divisors (3320434).

6640862 is a wasteful number, since it uses less digits than its factorization.

6640862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320433.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 6640862 is about 2576.9870003553. The cubic root of 6640862 is about 187.9640605813.

The spelling of 6640862 in words is "six million, six hundred forty thousand, eight hundred sixty-two".