678915243 has 8 divisors (see below), whose sum is σ = 1005800400. Its totient is φ = 452610144.

The previous prime is 678915241. The next prime is 678915323. The reversal of 678915243 is 342519876.

It is not a de Polignac number, because 678915243 - 2¹ = 678915241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678915241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12572478 + ... + 12572531.

It is an arithmetic number, because the mean of its divisors is an integer number (125725050).

Almost surely, 2^678915243 is an apocalyptic number.

678915243 is a deficient number, since it is larger than the sum of its proper divisors (326885157).

678915243 is a wasteful number, since it uses less digits than its factorization.

678915243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25145018 (or 25145012 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 678915243 is about 26056.0020532698. The cubic root of 678915243 is about 878.8980883374.

The spelling of 678915243 in words is "six hundred seventy-eight million, nine hundred fifteen thousand, two hundred forty-three".