6689629 has 2 divisors, whose sum is σ = 6689630. Its totient is φ = 6689628.

The previous prime is 6689623. The next prime is 6689659. The reversal of 6689629 is 9269866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6528025 + 161604 = 2555^2 + 402^2 .

It is a cyclic number.

It is not a de Polignac number, because 6689629 - 2⁹ = 6689117 is a prime.

It is a super-2 number, since 2×6689629² = 89502272315282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6689623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344814 + 3344815.

It is an arithmetic number, because the mean of its divisors is an integer number (3344815).

Almost surely, 2^6689629 is an apocalyptic number.

It is an amenable number.

6689629 is a deficient number, since it is larger than the sum of its proper divisors (1).

6689629 is an equidigital number, since it uses as much as digits as its factorization.

6689629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 6689629 is about 2586.4317118378. The cubic root of 6689629 is about 188.4230419901.

The spelling of 6689629 in words is "six million, six hundred eighty-nine thousand, six hundred twenty-nine".