678955219 has 2 divisors, whose sum is σ = 678955220. Its totient is φ = 678955218.

The previous prime is 678955213. The next prime is 678955237. The reversal of 678955219 is 912559876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678955219 - 2²⁵ = 645400787 is a prime.

It is a super-2 number, since 2×678955219² = 921960378814675922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (678955213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339477609 + 339477610.

It is an arithmetic number, because the mean of its divisors is an integer number (339477610).

Almost surely, 2^678955219 is an apocalyptic number.

678955219 is a deficient number, since it is larger than the sum of its proper divisors (1).

678955219 is an equidigital number, since it uses as much as digits as its factorization.

678955219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 52.

The square root of 678955219 is about 26056.7691588961. The cubic root of 678955219 is about 878.9153384732.

The spelling of 678955219 in words is "six hundred seventy-eight million, nine hundred fifty-five thousand, two hundred nineteen".