6620255 has 4 divisors (see below), whose sum is σ = 7944312. Its totient is φ = 5296200.

The previous prime is 6620231. The next prime is 6620261. The reversal of 6620255 is 5520266.

It is a happy number.

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

It is not a de Polignac number, because 6620255 - 2¹⁰ = 6619231 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 662021 + ... + 662030.

It is an arithmetic number, because the mean of its divisors is an integer number (1986078).

Almost surely, 2^6620255 is an apocalyptic number.

6620255 is a deficient number, since it is larger than the sum of its proper divisors (1324057).

6620255 is a wasteful number, since it uses less digits than its factorization.

6620255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324056.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 6620255 is about 2572.9856198588. The cubic root of 6620255 is about 187.7694378171.

The spelling of 6620255 in words is "six million, six hundred twenty thousand, two hundred fifty-five".