690813 has 6 divisors (see below), whose sum is σ = 997854. Its totient is φ = 460536.

The previous prime is 690793. The next prime is 690817. The reversal of 690813 is 318096.

It can be written as a sum of positive squares in only one way, i.e., 675684 + 15129 = 822^2 + 123^2 .

It is not a de Polignac number, because 690813 - 2¹⁰ = 689789 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690813.

It is not an unprimeable number, because it can be changed into a prime (690817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38370 + ... + 38387.

It is an arithmetic number, because the mean of its divisors is an integer number (166309).

2⁶⁹⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

690813 is a deficient number, since it is larger than the sum of its proper divisors (307041).

690813 is a wasteful number, since it uses less digits than its factorization.

690813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76763 (or 76760 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 690813 is about 831.1516107185. The cubic root of 690813 is about 88.4002514956.

The spelling of 690813 in words is "six hundred ninety thousand, eight hundred thirteen".