684128593 has 4 divisors (see below), whose sum is σ = 684563440. Its totient is φ = 683693748.

The previous prime is 684128539. The next prime is 684128597. The reversal of 684128593 is 395821486.

684128593 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 684128593 - 2¹³ = 684120401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684128597) 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, 215055 + ... + 218212.

It is an arithmetic number, because the mean of its divisors is an integer number (171140860).

Almost surely, 2^684128593 is an apocalyptic number.

It is an amenable number.

684128593 is a deficient number, since it is larger than the sum of its proper divisors (434847).

684128593 is a wasteful number, since it uses less digits than its factorization.

684128593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434846.

The product of its digits is 414720, while the sum is 46.

The square root of 684128593 is about 26155.8519838295. The cubic root of 684128593 is about 881.1420232341.

The spelling of 684128593 in words is "six hundred eighty-four million, one hundred twenty-eight thousand, five hundred ninety-three".