684293228978 has 18 divisors (see below), whose sum is σ = 1054997968311. Its totient is φ = 332878351104.

The previous prime is 684293228929. The next prime is 684293229019. The reversal of 684293228978 is 879822392486.

It can be written as a sum of positive squares in 5 ways, for example, as 248385614689 + 435907614289 = 498383^2 + 660233^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=584933.

It is a Smith number, since the sum of its digits (68) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43277138 + ... + 43292946.

Almost surely, 2^684293228978 is an apocalyptic number.

684293228978 is a deficient number, since it is larger than the sum of its proper divisors (370704739333).

684293228978 is an frugal number, since it uses more digits than its factorization.

684293228978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31694 (or 15848 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 68.

The spelling of 684293228978 in words is "six hundred eighty-four billion, two hundred ninety-three million, two hundred twenty-eight thousand, nine hundred seventy-eight".