6620689 has 2 divisors, whose sum is σ = 6620690. Its totient is φ = 6620688.

The previous prime is 6620681. The next prime is 6620693. The reversal of 6620689 is 9860266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6290064 + 330625 = 2508^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 6620689 - 2³ = 6620681 is a prime.

It is not a weakly prime, because it can be changed into another prime (6620681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310344 + 3310345.

It is an arithmetic number, because the mean of its divisors is an integer number (3310345).

Almost surely, 2^6620689 is an apocalyptic number.

It is an amenable number.

6620689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620689 is an equidigital number, since it uses as much as digits as its factorization.

6620689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 6620689 is about 2573.0699562973. The cubic root of 6620689 is about 187.7735408895.

The spelling of 6620689 in words is "six million, six hundred twenty thousand, six hundred eighty-nine".