6620687 has 4 divisors (see below), whose sum is σ = 6626256. Its totient is φ = 6615120.

The previous prime is 6620681. The next prime is 6620689. The reversal of 6620687 is 7860266.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6620687 - 2¹² = 6616591 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 (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, 203 + ... + 3644.

It is an arithmetic number, because the mean of its divisors is an integer number (1656564).

Almost surely, 2^6620687 is an apocalyptic number.

6620687 is a deficient number, since it is larger than the sum of its proper divisors (5569).

6620687 is a wasteful number, since it uses less digits than its factorization.

6620687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5568.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 6620687 is about 2573.0695676565. The cubic root of 6620687 is about 187.7735219817.

The spelling of 6620687 in words is "six million, six hundred twenty thousand, six hundred eighty-seven".