6820655 has 16 divisors (see below), whose sum is σ = 8968320. Its totient is φ = 4956672.

The previous prime is 6820643. The next prime is 6820663. The reversal of 6820655 is 5560286.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6820655 - 2¹⁸ = 6558511 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1082 + ... + 3848.

It is an arithmetic number, because the mean of its divisors is an integer number (560520).

Almost surely, 2^6820655 is an apocalyptic number.

6820655 is a deficient number, since it is larger than the sum of its proper divisors (2147665).

6820655 is a wasteful number, since it uses less digits than its factorization.

6820655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 6820655 is about 2611.6383746606. The cubic root of 6820655 is about 189.6452753627.

The spelling of 6820655 in words is "six million, eight hundred twenty thousand, six hundred fifty-five".