690659 has 4 divisors (see below), whose sum is σ = 731304. Its totient is φ = 650016.

The previous prime is 690629. The next prime is 690661. The reversal of 690659 is 956096.

690659 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690659 - 2¹² = 686563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20297 + ... + 20330.

It is an arithmetic number, because the mean of its divisors is an integer number (182826).

2⁶⁹⁰⁶⁵⁹ is an apocalyptic number.

690659 is a deficient number, since it is larger than the sum of its proper divisors (40645).

690659 is a wasteful number, since it uses less digits than its factorization.

690659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40644.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 690659 is about 831.0589630104. The cubic root of 690659 is about 88.3936821103.

The spelling of 690659 in words is "six hundred ninety thousand, six hundred fifty-nine".