690685 has 8 divisors (see below), whose sum is σ = 837216. Its totient is φ = 546960.

The previous prime is 690673. The next prime is 690689. The reversal of 690685 is 586096.

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

It is not a de Polignac number, because 690685 - 2¹¹ = 688637 is a prime.

It is a Duffinian number.

690685 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 690685.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111 + ... + 1180.

It is an arithmetic number, because the mean of its divisors is an integer number (104652).

2⁶⁹⁰⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

690685 is a deficient number, since it is larger than the sum of its proper divisors (146531).

690685 is a wasteful number, since it uses less digits than its factorization.

690685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 690685 is about 831.0746055560. The cubic root of 690685 is about 88.3947912958.

The spelling of 690685 in words is "six hundred ninety thousand, six hundred eighty-five".