684562789 has 4 divisors (see below), whose sum is σ = 703064524. Its totient is φ = 666061056.

The previous prime is 684562771. The next prime is 684562807. The reversal of 684562789 is 987265486.

684562789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (684562771) and next prime (684562807).

It can be written as a sum of positive squares in 2 ways, for example, as 315346564 + 369216225 = 17758^2 + 19215^2 .

It is a cyclic number.

It is not a de Polignac number, because 684562789 - 2⁵ = 684562757 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 (684568789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9250812 + ... + 9250885.

It is an arithmetic number, because the mean of its divisors is an integer number (175766131).

Almost surely, 2^684562789 is an apocalyptic number.

It is an amenable number.

684562789 is a deficient number, since it is larger than the sum of its proper divisors (18501735).

684562789 is a wasteful number, since it uses less digits than its factorization.

684562789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18501734.

The product of its digits is 5806080, while the sum is 55.

The square root of 684562789 is about 26164.1508365932. The cubic root of 684562789 is about 881.3283953262.

The spelling of 684562789 in words is "six hundred eighty-four million, five hundred sixty-two thousand, seven hundred eighty-nine".