6620330 has 16 divisors (see below), whose sum is σ = 12113064. Its totient is φ = 2604480.

The previous prime is 6620309. The next prime is 6620351. The reversal of 6620330 is 330266.

It is a happy number.

It is a Cunningham number, because it is equal to 2573²+1.

It is an interprime number because it is at equal distance from previous prime (6620309) and next prime (6620351).

It can be written as a sum of positive squares in 4 ways, for example, as 3568321 + 3052009 = 1889^2 + 1747^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4817 + ... + 6036.

Almost surely, 2^6620330 is an apocalyptic number.

6620330 is a deficient number, since it is larger than the sum of its proper divisors (5492734).

6620330 is a wasteful number, since it uses less digits than its factorization.

6620330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10921.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 6620330 is about 2573.0001943257. Note that the first 3 decimals coincide. The cubic root of 6620330 is about 187.7701468862.

Adding to 6620330 its reverse (330266), we get a palindrome (6950596).

Subtracting from 6620330 its reverse (330266), we obtain a square (6290064 = 2508²).

The spelling of 6620330 in words is "six million, six hundred twenty thousand, three hundred thirty".