689480405 has 4 divisors (see below), whose sum is σ = 827376492. Its totient is φ = 551584320.

The previous prime is 689480387. The next prime is 689480411. The reversal of 689480405 is 504084986.

It is a happy number.

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 369177796 + 320302609 = 19214^2 + 17897^2 .

It is not a de Polignac number, because 689480405 - 2¹⁸ = 689218261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 68948036 + ... + 68948045.

It is an arithmetic number, because the mean of its divisors is an integer number (206844123).

Almost surely, 2^689480405 is an apocalyptic number.

It is an amenable number.

689480405 is a deficient number, since it is larger than the sum of its proper divisors (137896087).

689480405 is a wasteful number, since it uses less digits than its factorization.

689480405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137896086.

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 689480405 is about 26257.9588886874. The cubic root of 689480405 is about 883.4337283147.

The spelling of 689480405 in words is "six hundred eighty-nine million, four hundred eighty thousand, four hundred five".