678765623 has 2 divisors, whose sum is σ = 678765624. Its totient is φ = 678765622.

The previous prime is 678765599. The next prime is 678765679. The reversal of 678765623 is 326567876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678765623 - 2¹² = 678761527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678765683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339382811 + 339382812.

It is an arithmetic number, because the mean of its divisors is an integer number (339382812).

Almost surely, 2^678765623 is an apocalyptic number.

678765623 is a deficient number, since it is larger than the sum of its proper divisors (1).

678765623 is an equidigital number, since it uses as much as digits as its factorization.

678765623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 50.

The square root of 678765623 is about 26053.1307715599. The cubic root of 678765623 is about 878.8335194560.

The spelling of 678765623 in words is "six hundred seventy-eight million, seven hundred sixty-five thousand, six hundred twenty-three".