678706129 has 4 divisors (see below), whose sum is σ = 679005184. Its totient is φ = 678407076.

The previous prime is 678706123. The next prime is 678706139. The reversal of 678706129 is 921607876.

It is a happy number.

678706129 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 678706129 - 2⁹ = 678705617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678706123) 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, 146097 + ... + 150670.

It is an arithmetic number, because the mean of its divisors is an integer number (169751296).

Almost surely, 2^678706129 is an apocalyptic number.

It is an amenable number.

678706129 is a deficient number, since it is larger than the sum of its proper divisors (299055).

678706129 is a wasteful number, since it uses less digits than its factorization.

678706129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299054.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 678706129 is about 26051.9889643766. The cubic root of 678706129 is about 878.8078420365.

The spelling of 678706129 in words is "six hundred seventy-eight million, seven hundred six thousand, one hundred twenty-nine".