684660646 has 8 divisors (see below), whose sum is σ = 1027102824. Its totient is φ = 342293040.

The previous prime is 684660631. The next prime is 684660659. The reversal of 684660646 is 646066486.

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

It is a super-2 number, since 2×684660646² = 937520400362274632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 684660596 and 684660605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22266 + ... + 43186.

It is an arithmetic number, because the mean of its divisors is an integer number (128387853).

Almost surely, 2^684660646 is an apocalyptic number.

684660646 is a deficient number, since it is larger than the sum of its proper divisors (342442178).

684660646 is a wasteful number, since it uses less digits than its factorization.

684660646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37286.

The product of its (nonzero) digits is 995328, while the sum is 46.

The square root of 684660646 is about 26166.0208285479. The cubic root of 684660646 is about 881.3703880866.

The spelling of 684660646 in words is "six hundred eighty-four million, six hundred sixty thousand, six hundred forty-six".