678729853 has 4 divisors (see below), whose sum is σ = 681434208. Its totient is φ = 676025500.

The previous prime is 678729851. The next prime is 678729869. The reversal of 678729853 is 358927876.

678729853 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 678729853 - 2¹ = 678729851 is a prime.

It is a super-3 number, since 3×678729853³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678729794 and 678729803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678729851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1351801 + ... + 1352302.

It is an arithmetic number, because the mean of its divisors is an integer number (170358552).

Almost surely, 2^678729853 is an apocalyptic number.

It is an amenable number.

678729853 is a deficient number, since it is larger than the sum of its proper divisors (2704355).

678729853 is a wasteful number, since it uses less digits than its factorization.

678729853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704354.

The product of its digits is 5080320, while the sum is 55.

The square root of 678729853 is about 26052.4442807196. Note that the first 3 decimals coincide. The cubic root of 678729853 is about 878.8180814187.

The spelling of 678729853 in words is "six hundred seventy-eight million, seven hundred twenty-nine thousand, eight hundred fifty-three".