678082735845 has 24 divisors (see below), whose sum is σ = 1215872494200. Its totient is φ = 349173638016.

The previous prime is 678082735789. The next prime is 678082735849. The reversal of 678082735845 is 548537280876.

It can be written as a sum of positive squares in 4 ways, for example, as 1875842721 + 676206893124 = 43311^2 + 822318^2 .

It is not a de Polignac number, because 678082735845 - 2⁹ = 678082735333 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678082735849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 259800510 + ... + 259803119.

It is an arithmetic number, because the mean of its divisors is an integer number (50661353925).

Almost surely, 2^678082735845 is an apocalyptic number.

It is an amenable number.

678082735845 is a deficient number, since it is larger than the sum of its proper divisors (537789758355).

678082735845 is a wasteful number, since it uses less digits than its factorization.

678082735845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519603669 (or 519603666 counting only the distinct ones).

The product of its (nonzero) digits is 90316800, while the sum is 63.

The spelling of 678082735845 in words is "six hundred seventy-eight billion, eighty-two million, seven hundred thirty-five thousand, eight hundred forty-five".