690629 has 2 divisors, whose sum is σ = 690630. Its totient is φ = 690628.

The previous prime is 690611. The next prime is 690661. The reversal of 690629 is 926096.

It is an a-pointer prime, because the next prime (690661) can be obtained adding 690629 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388129 + 302500 = 623^2 + 550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 690595 and 690604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345314 + 345315.

It is an arithmetic number, because the mean of its divisors is an integer number (345315).

2⁶⁹⁰⁶²⁹ is an apocalyptic number.

It is an amenable number.

690629 is a deficient number, since it is larger than the sum of its proper divisors (1).

690629 is an equidigital number, since it uses as much as digits as its factorization.

690629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 690629 is about 831.0409135536. The cubic root of 690629 is about 88.3924022462.

The spelling of 690629 in words is "six hundred ninety thousand, six hundred twenty-nine".