678909223 has 2 divisors, whose sum is σ = 678909224. Its totient is φ = 678909222.

The previous prime is 678909211. The next prime is 678909251. The reversal of 678909223 is 322909876.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678909223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678909323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339454611 + 339454612.

It is an arithmetic number, because the mean of its divisors is an integer number (339454612).

Almost surely, 2^678909223 is an apocalyptic number.

678909223 is a deficient number, since it is larger than the sum of its proper divisors (1).

678909223 is an equidigital number, since it uses as much as digits as its factorization.

678909223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 678909223 is about 26055.8865326053. The cubic root of 678909223 is about 878.8954905746.

The spelling of 678909223 in words is "six hundred seventy-eight million, nine hundred nine thousand, two hundred twenty-three".