678652189 has 4 divisors (see below), whose sum is σ = 718572924. Its totient is φ = 638731456.

The previous prime is 678652159. The next prime is 678652193. The reversal of 678652189 is 981256876.

678652189 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.

It can be written as a sum of positive squares in 2 ways, for example, as 581629689 + 97022500 = 24117^2 + 9850^2 .

It is a cyclic number.

It is not a de Polignac number, because 678652189 - 2⁵ = 678652157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678652159) 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, 19960342 + ... + 19960375.

It is an arithmetic number, because the mean of its divisors is an integer number (179643231).

Almost surely, 2^678652189 is an apocalyptic number.

It is an amenable number.

678652189 is a deficient number, since it is larger than the sum of its proper divisors (39920735).

678652189 is a wasteful number, since it uses less digits than its factorization.

678652189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39920734.

The product of its digits is 1451520, while the sum is 52.

The square root of 678652189 is about 26050.9537061506. The cubic root of 678652189 is about 878.7845604085.

The spelling of 678652189 in words is "six hundred seventy-eight million, six hundred fifty-two thousand, one hundred eighty-nine".