6620256 has 72 divisors (see below), whose sum is σ = 19079424. Its totient is φ = 2177280.

The previous prime is 6620231. The next prime is 6620261. The reversal of 6620256 is 6520266.

It is a tau number, because it is divible by the number of its divisors (72).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36486 + ... + 36666.

It is an arithmetic number, because the mean of its divisors is an integer number (264992).

Almost surely, 2^6620256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6620256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9539712).

6620256 is an abundant number, since it is smaller than the sum of its proper divisors (12459168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6620256 is a wasteful number, since it uses less digits than its factorization.

6620256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 6620256 is about 2572.9858141855. The cubic root of 6620256 is about 187.7694472714.

The spelling of 6620256 in words is "six million, six hundred twenty thousand, two hundred fifty-six".