690769 has 4 divisors (see below), whose sum is σ = 696996. Its totient is φ = 684544.

The previous prime is 690757. The next prime is 690787. The reversal of 690769 is 967096.

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

It can be written as a sum of positive squares in 2 ways, for example, as 150544 + 540225 = 388^2 + 735^2 .

It is a cyclic number.

It is not a de Polignac number, because 690769 - 2¹⁵ = 658001 is a prime.

It is a super-2 number, since 2×690769² = 954323622722, which contains 22 as substring.

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

It is a Duffinian 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, 2944 + ... + 3169.

It is an arithmetic number, because the mean of its divisors is an integer number (174249).

2⁶⁹⁰⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

690769 is a deficient number, since it is larger than the sum of its proper divisors (6227).

690769 is a wasteful number, since it uses less digits than its factorization.

690769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6226.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 690769 is about 831.1251409986. The cubic root of 690769 is about 88.3983746280.

The spelling of 690769 in words is "six hundred ninety thousand, seven hundred sixty-nine".