690304 has 16 divisors (see below), whose sum is σ = 1375470. Its totient is φ = 345088.

The previous prime is 690293. The next prime is 690323. The reversal of 690304 is 403096.

It can be written as a sum of positive squares in only one way, i.e., 419904 + 270400 = 648^2 + 520^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×690304² = 953039224832, which contains 22 as substring.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 16.

It is an unprimeable number.

690304 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 (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2569 + ... + 2824.

2⁶⁹⁰³⁰⁴ is an apocalyptic number.

690304 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

690304 is a deficient number, since it is larger than the sum of its proper divisors (685166).

690304 is an equidigital number, since it uses as much as digits as its factorization.

690304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5407 (or 5395 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 690304 is about 830.8453526379. The cubic root of 690304 is about 88.3785346761.

The spelling of 690304 in words is "six hundred ninety thousand, three hundred four".