684344649 has 8 divisors (see below), whose sum is σ = 913357312. Its totient is φ = 455780880.

The previous prime is 684344629. The next prime is 684344659. The reversal of 684344649 is 946443486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 684344649 - 2¹¹ = 684342601 is a prime.

It is a super-2 number, since 2×684344649² = 936655197229866402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684344598 and 684344607.

It is not an unprimeable number, because it can be changed into a prime (684344629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108649 + ... + 114774.

It is an arithmetic number, because the mean of its divisors is an integer number (114169664).

Almost surely, 2^684344649 is an apocalyptic number.

It is an amenable number.

684344649 is a deficient number, since it is larger than the sum of its proper divisors (229012663).

684344649 is a wasteful number, since it uses less digits than its factorization.

684344649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224447.

The product of its digits is 1990656, while the sum is 48.

The square root of 684344649 is about 26159.9818233882. The cubic root of 684344649 is about 881.2347718711.

The spelling of 684344649 in words is "six hundred eighty-four million, three hundred forty-four thousand, six hundred forty-nine".