684865726 has 4 divisors (see below), whose sum is σ = 1027298592. Its totient is φ = 342432862.

The previous prime is 684865703. The next prime is 684865729. The reversal of 684865726 is 627568486.

684865726 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684865729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171216430 + ... + 171216433.

It is an arithmetic number, because the mean of its divisors is an integer number (256824648).

Almost surely, 2^684865726 is an apocalyptic number.

684865726 is a deficient number, since it is larger than the sum of its proper divisors (342432866).

684865726 is a wasteful number, since it uses less digits than its factorization.

684865726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342432865.

The product of its digits is 3870720, while the sum is 52.

The square root of 684865726 is about 26169.9393579733. The cubic root of 684865726 is about 881.4583798025.

The spelling of 684865726 in words is "six hundred eighty-four million, eight hundred sixty-five thousand, seven hundred twenty-six".