6620993 has 8 divisors (see below), whose sum is σ = 6748896. Its totient is φ = 6494400.

The previous prime is 6620981. The next prime is 6621029. The reversal of 6620993 is 3990266.

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 6620993 - 2¹⁶ = 6555457 is a prime.

6620993 is a modest number, since divided by 993 gives 662 as remainder.

It is not an unprimeable number, because it can be changed into a prime (6620953) 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, 19838 + ... + 20168.

It is an arithmetic number, because the mean of its divisors is an integer number (843612).

Almost surely, 2^6620993 is an apocalyptic number.

It is an amenable number.

6620993 is a deficient number, since it is larger than the sum of its proper divisors (127903).

6620993 is a wasteful number, since it uses less digits than its factorization.

6620993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 6620993 is about 2573.1290290228. The cubic root of 6620993 is about 187.7764148241.

The spelling of 6620993 in words is "six million, six hundred twenty thousand, nine hundred ninety-three".