690673 has 2 divisors, whose sum is σ = 690674. Its totient is φ = 690672.

The previous prime is 690661. The next prime is 690689. The reversal of 690673 is 376096.

690673 is nontrivially palindromic in base 15.

690673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659344 + 31329 = 812^2 + 177^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690673 is a prime.

It is equal to p₅₅₈₅₈ and since 690673 and 55858 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (690073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345336 + 345337.

It is an arithmetic number, because the mean of its divisors is an integer number (345337).

2⁶⁹⁰⁶⁷³ is an apocalyptic number.

It is an amenable number.

690673 is a deficient number, since it is larger than the sum of its proper divisors (1).

690673 is an equidigital number, since it uses as much as digits as its factorization.

690673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 690673 is about 831.0673859562. The cubic root of 690673 is about 88.3942793675.

The spelling of 690673 in words is "six hundred ninety thousand, six hundred seventy-three".