678921089 has 16 divisors (see below), whose sum is σ = 847021056. Its totient is φ = 528670800.

The previous prime is 678921073. The next prime is 678921121. The reversal of 678921089 is 980129876.

It is not a de Polignac number, because 678921089 - 2⁴ = 678921073 is a prime.

It is a super-3 number, since 3×678921089³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (678924089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202154 + ... + 205484.

It is an arithmetic number, because the mean of its divisors is an integer number (52938816).

Almost surely, 2^678921089 is an apocalyptic number.

It is an amenable number.

678921089 is a deficient number, since it is larger than the sum of its proper divisors (168099967).

678921089 is a wasteful number, since it uses less digits than its factorization.

678921089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 678921089 is about 26056.1142344748. The cubic root of 678921089 is about 878.9006110006.

The spelling of 678921089 in words is "six hundred seventy-eight million, nine hundred twenty-one thousand, eighty-nine".