6620290 has 8 divisors (see below), whose sum is σ = 11916540. Its totient is φ = 2648112.

The previous prime is 6620287. The next prime is 6620291. The reversal of 6620290 is 920266.

It can be written as a sum of positive squares in 2 ways, for example, as 6285049 + 335241 = 2507^2 + 579^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (6620291) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 331005 + ... + 331024.

Almost surely, 2^6620290 is an apocalyptic number.

6620290 is a deficient number, since it is larger than the sum of its proper divisors (5296250).

6620290 is a wasteful number, since it uses less digits than its factorization.

6620290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662036.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 6620290 is about 2572.9924212869. The cubic root of 6620290 is about 187.7697687167.

The spelling of 6620290 in words is "six million, six hundred twenty thousand, two hundred ninety".