684328649 has 4 divisors (see below), whose sum is σ = 684460800. Its totient is φ = 684196500.

The previous prime is 684328607. The next prime is 684328657. The reversal of 684328649 is 946823486.

It is a happy number.

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 684328649 - 2²⁴ = 667551433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684328597 and 684328606.

It is not an unprimeable number, because it can be changed into a prime (684328699) 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, 57977 + ... + 68774.

It is an arithmetic number, because the mean of its divisors is an integer number (171115200).

Almost surely, 2^684328649 is an apocalyptic number.

It is an amenable number.

684328649 is a deficient number, since it is larger than the sum of its proper divisors (132151).

684328649 is a wasteful number, since it uses less digits than its factorization.

684328649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132150.

The product of its digits is 1990656, while the sum is 50.

The square root of 684328649 is about 26159.6760109907. The cubic root of 684328649 is about 881.2279040517.

The spelling of 684328649 in words is "six hundred eighty-four million, three hundred twenty-eight thousand, six hundred forty-nine".