678963625 has 16 divisors (see below), whose sum is σ = 856097424. Its totient is φ = 537561600.

The previous prime is 678963619. The next prime is 678963641. The reversal of 678963625 is 526369876.

It can be written as a sum of positive squares in 8 ways, for example, as 268009641 + 410953984 = 16371^2 + 20272^2 .

It is not a de Polignac number, because 678963625 - 2⁹ = 678963113 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is an unprimeable number.

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, 15874 + ... + 40123.

It is an arithmetic number, because the mean of its divisors is an integer number (53506089).

Almost surely, 2^678963625 is an apocalyptic number.

It is an amenable number.

678963625 is a deficient number, since it is larger than the sum of its proper divisors (177133799).

678963625 is an equidigital number, since it uses as much as digits as its factorization.

678963625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56109 (or 56099 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 52.

The square root of 678963625 is about 26056.9304600523. The cubic root of 678963625 is about 878.9189656794.

The spelling of 678963625 in words is "six hundred seventy-eight million, nine hundred sixty-three thousand, six hundred twenty-five".