684609788 has 18 divisors (see below), whose sum is σ = 1272689376. Its totient is φ = 322168768.

The previous prime is 684609781. The next prime is 684609829. The reversal of 684609788 is 887906486.

684609788 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684609781) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 294956 + ... + 297267.

Almost surely, 2^684609788 is an apocalyptic number.

684609788 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

684609788 is a deficient number, since it is larger than the sum of its proper divisors (588079588).

684609788 is a wasteful number, since it uses less digits than its factorization.

684609788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592261 (or 592242 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 56.

The square root of 684609788 is about 26165.0489775960. The cubic root of 684609788 is about 881.3485642116.

The spelling of 684609788 in words is "six hundred eighty-four million, six hundred nine thousand, seven hundred eighty-eight".