690868 has 6 divisors (see below), whose sum is σ = 1209026. Its totient is φ = 345432.

The previous prime is 690841. The next prime is 690869. The reversal of 690868 is 868096.

690868 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in only one way, i.e., 580644 + 110224 = 762^2 + 332^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86355 + ... + 86362.

2⁶⁹⁰⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

690868 is a deficient number, since it is larger than the sum of its proper divisors (518158).

690868 is a wasteful number, since it uses less digits than its factorization.

690868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172721 (or 172719 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 690868 is about 831.1846966830. The cubic root of 690868 is about 88.4025974681.

The spelling of 690868 in words is "six hundred ninety thousand, eight hundred sixty-eight".