6630621 has 16 divisors (see below), whose sum is σ = 9246720. Its totient is φ = 4221360.

The previous prime is 6630607. The next prime is 6630641. The reversal of 6630621 is 1260366.

It is a de Polignac number, because none of the positive numbers 2^k-6630621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6630591 and 6630600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6630641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7290 + ... + 8148.

It is an arithmetic number, because the mean of its divisors is an integer number (577920).

Almost surely, 2^6630621 is an apocalyptic number.

It is an amenable number.

6630621 is a deficient number, since it is larger than the sum of its proper divisors (2616099).

6630621 is a wasteful number, since it uses less digits than its factorization.

6630621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 6630621 is about 2574.9992233009. Note that the first 3 decimals coincide. The cubic root of 6630621 is about 187.8673898836.

Adding to 6630621 its reverse (1260366), we get a palindrome (7890987).

The spelling of 6630621 in words is "six million, six hundred thirty thousand, six hundred twenty-one".