678455923 has 2 divisors, whose sum is σ = 678455924. Its totient is φ = 678455922.

The previous prime is 678455917. The next prime is 678455963. The reversal of 678455923 is 329554876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678455923 - 2⁵ = 678455891 is a prime.

It is not a weakly prime, because it can be changed into another prime (678455963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339227961 + 339227962.

It is an arithmetic number, because the mean of its divisors is an integer number (339227962).

Almost surely, 2^678455923 is an apocalyptic number.

678455923 is a deficient number, since it is larger than the sum of its proper divisors (1).

678455923 is an equidigital number, since it uses as much as digits as its factorization.

678455923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 49.

The square root of 678455923 is about 26047.1864699434. The cubic root of 678455923 is about 878.6998375010.

The spelling of 678455923 in words is "six hundred seventy-eight million, four hundred fifty-five thousand, nine hundred twenty-three".