690280 has 16 divisors (see below), whose sum is σ = 1553220. Its totient is φ = 276096.

The previous prime is 690271. The next prime is 690281. The reversal of 690280 is 82096.

It can be written as a sum of positive squares in 2 ways, for example, as 599076 + 91204 = 774^2 + 302^2 .

It is not an unprimeable number, because it can be changed into a prime (690281) by changing a digit.

690280 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8589 + ... + 8668.

2⁶⁹⁰²⁸⁰ is an apocalyptic number.

It is an amenable number.

690280 is an abundant number, since it is smaller than the sum of its proper divisors (862940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690280 is a wasteful number, since it uses less digits than its factorization.

690280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17268 (or 17264 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 690280 is about 830.8309093913. The cubic root of 690280 is about 88.3775104369.

The spelling of 690280 in words is "six hundred ninety thousand, two hundred eighty".