678390781010 has 32 divisors (see below), whose sum is σ = 1251508113072. Its totient is φ = 264606289920.

The previous prime is 678390780989. The next prime is 678390781067. The reversal of 678390781010 is 10187093876.

It can be written as a sum of positive squares in 8 ways, for example, as 296690464249 + 381700316761 = 544693^2 + 617819^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 678390781010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 416804 + ... + 1237136.

Almost surely, 2^678390781010 is an apocalyptic number.

678390781010 is a deficient number, since it is larger than the sum of its proper divisors (573117332062).

678390781010 is a wasteful number, since it uses less digits than its factorization.

678390781010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822398.

The product of its (nonzero) digits is 508032, while the sum is 50.

The spelling of 678390781010 in words is "six hundred seventy-eight billion, three hundred ninety million, seven hundred eighty-one thousand, ten".