690669 has 24 divisors (see below), whose sum is σ = 1202240. Its totient is φ = 373248.

The previous prime is 690661. The next prime is 690673. The reversal of 690669 is 966096.

It is not a de Polignac number, because 690669 - 2³ = 690661 is a prime.

It is a super-2 number, since 2×690669² = 954047335122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 909 + ... + 1485.

2⁶⁹⁰⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

690669 is a deficient number, since it is larger than the sum of its proper divisors (511571).

690669 is a wasteful number, since it uses less digits than its factorization.

690669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 690669 is about 831.0649794090. The cubic root of 690669 is about 88.3941087234.

The spelling of 690669 in words is "six hundred ninety thousand, six hundred sixty-nine".