690805 has 8 divisors (see below), whose sum is σ = 865152. Its totient is φ = 528528.

The previous prime is 690793. The next prime is 690817. The reversal of 690805 is 508096.

690805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (690793) and next prime (690817).

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

It is a cyclic number.

It is not a de Polignac number, because 690805 - 2⁹ = 690293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2889 + ... + 3118.

It is an arithmetic number, because the mean of its divisors is an integer number (108144).

2⁶⁹⁰⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

690805 is a deficient number, since it is larger than the sum of its proper divisors (174347).

690805 is a wasteful number, since it uses less digits than its factorization.

690805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6035.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 690805 is about 831.1467981049. The cubic root of 690805 is about 88.3999102529.

The spelling of 690805 in words is "six hundred ninety thousand, eight hundred five".