678812273 has 2 divisors, whose sum is σ = 678812274. Its totient is φ = 678812272.

The previous prime is 678812257. The next prime is 678812291. The reversal of 678812273 is 372218876.

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., 526610704 + 152201569 = 22948^2 + 12337^2 .

It is a cyclic number.

It is not a de Polignac number, because 678812273 - 2⁴ = 678812257 is a prime.

It is a super-2 number, since 2×678812273² = 921572203950853058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (678812203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339406136 + 339406137.

It is an arithmetic number, because the mean of its divisors is an integer number (339406137).

Almost surely, 2^678812273 is an apocalyptic number.

It is an amenable number.

678812273 is a deficient number, since it is larger than the sum of its proper divisors (1).

678812273 is an equidigital number, since it uses as much as digits as its factorization.

678812273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 44.

The square root of 678812273 is about 26054.0260420535. The cubic root of 678812273 is about 878.8536523969.

The spelling of 678812273 in words is "six hundred seventy-eight million, eight hundred twelve thousand, two hundred seventy-three".