690646 has 8 divisors (see below), whose sum is σ = 1130184. Its totient is φ = 313920.

The previous prime is 690629. The next prime is 690661. The reversal of 690646 is 646096.

690646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15675 + ... + 15718.

It is an arithmetic number, because the mean of its divisors is an integer number (141273).

2⁶⁹⁰⁶⁴⁶ is an apocalyptic number.

690646 is a deficient number, since it is larger than the sum of its proper divisors (439538).

690646 is a wasteful number, since it uses less digits than its factorization.

690646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31406.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 690646 is about 831.0511416273. The cubic root of 690646 is about 88.3931275071.

The spelling of 690646 in words is "six hundred ninety thousand, six hundred forty-six".