690643 has 8 divisors (see below), whose sum is σ = 716688. Its totient is φ = 665184.

The previous prime is 690629. The next prime is 690661. The reversal of 690643 is 346096.

690643 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 cyclic number.

It is not a de Polignac number, because 690643 - 2⁵ = 690611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690673) 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, 4321 + ... + 4477.

It is an arithmetic number, because the mean of its divisors is an integer number (89586).

2⁶⁹⁰⁶⁴³ is an apocalyptic number.

690643 is a deficient number, since it is larger than the sum of its proper divisors (26045).

690643 is a wasteful number, since it uses less digits than its factorization.

690643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 690643 is about 831.0493366822. The cubic root of 690643 is about 88.3929995207.

The spelling of 690643 in words is "six hundred ninety thousand, six hundred forty-three".