6620711 has 4 divisors (see below), whose sum is σ = 6908592. Its totient is φ = 6332832.

The previous prime is 6620699. The next prime is 6620717. The reversal of 6620711 is 1170266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6620711 - 2¹⁰ = 6619687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 287857 = 6620711 / (6 + 6 + 2 + 0 + 7 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620717) 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, 143906 + ... + 143951.

It is an arithmetic number, because the mean of its divisors is an integer number (1727148).

Almost surely, 2^6620711 is an apocalyptic number.

6620711 is a deficient number, since it is larger than the sum of its proper divisors (287881).

6620711 is a wasteful number, since it uses less digits than its factorization.

6620711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287880.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 6620711 is about 2573.0742313427. The cubic root of 6620711 is about 187.7737488745.

Adding to 6620711 its reverse (1170266), we get a palindrome (7790977).

The spelling of 6620711 in words is "six million, six hundred twenty thousand, seven hundred eleven".