684534641 has 16 divisors (see below), whose sum is σ = 827842560. Its totient is φ = 552931920.

The previous prime is 684534623. The next prime is 684534691. The reversal of 684534641 is 146435486.

It is a happy number.

684534641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 684534641 - 2⁶ = 684534577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (684534691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11930 + ... + 38876.

It is an arithmetic number, because the mean of its divisors is an integer number (51740160).

Almost surely, 2^684534641 is an apocalyptic number.

It is an amenable number.

684534641 is a deficient number, since it is larger than the sum of its proper divisors (143307919).

684534641 is a wasteful number, since it uses less digits than its factorization.

684534641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27164.

The product of its digits is 276480, while the sum is 41.

The square root of 684534641 is about 26163.6129194727. The cubic root of 684534641 is about 881.3163156104.

The spelling of 684534641 in words is "six hundred eighty-four million, five hundred thirty-four thousand, six hundred forty-one".