684844644 has 48 divisors (see below), whose sum is σ = 1744920576. Its totient is φ = 207328800.

The previous prime is 684844613. The next prime is 684844651. The reversal of 684844644 is 446448486.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 684844593 and 684844602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192409 + ... + 195935.

It is an arithmetic number, because the mean of its divisors is an integer number (36352512).

Almost surely, 2^684844644 is an apocalyptic number.

It is an amenable number.

684844644 is an abundant number, since it is smaller than the sum of its proper divisors (1060075932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684844644 is a wasteful number, since it uses less digits than its factorization.

684844644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5016 (or 5014 counting only the distinct ones).

The product of its digits is 2359296, while the sum is 48.

The square root of 684844644 is about 26169.5365644866. The cubic root of 684844644 is about 881.4493351603.

The spelling of 684844644 in words is "six hundred eighty-four million, eight hundred forty-four thousand, six hundred forty-four".