690686 has 8 divisors (see below), whose sum is σ = 1061424. Its totient is φ = 336880.

The previous prime is 690673. The next prime is 690689. The reversal of 690686 is 686096.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690686.

It is not an unprimeable number, because it can be changed into a prime (690689) by changing a digit.

690686 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4130 + ... + 4293.

It is an arithmetic number, because the mean of its divisors is an integer number (132678).

2⁶⁹⁰⁶⁸⁶ is an apocalyptic number.

690686 is a deficient number, since it is larger than the sum of its proper divisors (370738).

690686 is a wasteful number, since it uses less digits than its factorization.

690686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8466.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 690686 is about 831.0752071864. The cubic root of 690686 is about 88.3948339562.

The spelling of 690686 in words is "six hundred ninety thousand, six hundred eighty-six".