690080309 has 4 divisors (see below), whose sum is σ = 690138540. Its totient is φ = 690022080.

The previous prime is 690080267. The next prime is 690080381. The reversal of 690080309 is 903080096.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 61575409 + 628504900 = 7847^2 + 25070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690080309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690083309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4274 + ... + 37395.

It is an arithmetic number, because the mean of its divisors is an integer number (172534635).

Almost surely, 2^690080309 is an apocalyptic number.

It is an amenable number.

690080309 is a deficient number, since it is larger than the sum of its proper divisors (58231).

690080309 is a wasteful number, since it uses less digits than its factorization.

690080309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58230.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 690080309 is about 26269.3796843397. The cubic root of 690080309 is about 883.6898737592.

The spelling of 690080309 in words is "six hundred ninety million, eighty thousand, three hundred nine".