690709 has 4 divisors (see below), whose sum is σ = 706816. Its totient is φ = 674604.

The previous prime is 690689. The next prime is 690719. The reversal of 690709 is 907096.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 690709 - 2¹¹ = 688661 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690719) 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, 7989 + ... + 8074.

It is an arithmetic number, because the mean of its divisors is an integer number (176704).

2⁶⁹⁰⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

690709 is a deficient number, since it is larger than the sum of its proper divisors (16107).

690709 is a wasteful number, since it uses less digits than its factorization.

690709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16106.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 690709 is about 831.0890445674. The cubic root of 690709 is about 88.3958151346.

The spelling of 690709 in words is "six hundred ninety thousand, seven hundred nine".