678923837 has 2 divisors, whose sum is σ = 678923838. Its totient is φ = 678923836.

The previous prime is 678923807. The next prime is 678923887. The reversal of 678923837 is 738329876.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 635745796 + 43178041 = 25214^2 + 6571^2 .

It is a cyclic number.

It is not a de Polignac number, because 678923837 - 2¹² = 678919741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678923807) by changing a digit.

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 as a sum of consecutive naturals, namely, 339461918 + 339461919.

It is an arithmetic number, because the mean of its divisors is an integer number (339461919).

Almost surely, 2^678923837 is an apocalyptic number.

It is an amenable number.

678923837 is a deficient number, since it is larger than the sum of its proper divisors (1).

678923837 is an equidigital number, since it uses as much as digits as its factorization.

678923837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 53.

The square root of 678923837 is about 26056.1669667662. The cubic root of 678923837 is about 878.9017968112.

The spelling of 678923837 in words is "six hundred seventy-eight million, nine hundred twenty-three thousand, eight hundred thirty-seven".