6623621 has 8 divisors (see below), whose sum is σ = 6761664. Its totient is φ = 6487200.

The previous prime is 6623611. The next prime is 6623707. The reversal of 6623621 is 1263266.

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

It is a cyclic number.

It is not a de Polignac number, because 6623621 - 2¹⁸ = 6361477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6623611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10721 + ... + 11321.

It is an arithmetic number, because the mean of its divisors is an integer number (845208).

Almost surely, 2^6623621 is an apocalyptic number.

It is an amenable number.

6623621 is a deficient number, since it is larger than the sum of its proper divisors (138043).

6623621 is a wasteful number, since it uses less digits than its factorization.

6623621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811.

The product of its digits is 2592, while the sum is 26.

The square root of 6623621 is about 2573.6396406646. The cubic root of 6623621 is about 187.8012555664.

Adding to 6623621 its reverse (1263266), we get a palindrome (7886887).

The spelling of 6623621 in words is "six million, six hundred twenty-three thousand, six hundred twenty-one".