6620686 has 8 divisors (see below), whose sum is σ = 9942984. Its totient is φ = 3306360.

The previous prime is 6620681. The next prime is 6620689. The reversal of 6620686 is 6860266.

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

It is a super-2 number, since 2×6620686² = 87666966221192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 961 + ... + 3763.

It is an arithmetic number, because the mean of its divisors is an integer number (1242873).

Almost surely, 2^6620686 is an apocalyptic number.

6620686 is a deficient number, since it is larger than the sum of its proper divisors (3322298).

6620686 is a wasteful number, since it uses less digits than its factorization.

6620686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 6620686 is about 2573.0693733361. The cubic root of 6620686 is about 187.7735125278.

The spelling of 6620686 in words is "six million, six hundred twenty thousand, six hundred eighty-six".