678873725 has 6 divisors (see below), whose sum is σ = 841803450. Its totient is φ = 543098960.

The previous prime is 678873709. The next prime is 678873739. The reversal of 678873725 is 527378876.

It can be written as a sum of positive squares in 3 ways, for example, as 32239684 + 646634041 = 5678^2 + 25429^2 .

It is not a de Polignac number, because 678873725 - 2⁴ = 678873709 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13577450 + ... + 13577499.

It is an arithmetic number, because the mean of its divisors is an integer number (140300575).

Almost surely, 2^678873725 is an apocalyptic number.

It is an amenable number.

678873725 is a deficient number, since it is larger than the sum of its proper divisors (162929725).

678873725 is a wasteful number, since it uses less digits than its factorization.

678873725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27154959 (or 27154954 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 53.

The square root of 678873725 is about 26055.2053340594. The cubic root of 678873725 is about 878.8801720928.

The spelling of 678873725 in words is "six hundred seventy-eight million, eight hundred seventy-three thousand, seven hundred twenty-five".