678298905 has 12 divisors (see below), whose sum is σ = 1175718180. Its totient is φ = 361759392.

The previous prime is 678298903. The next prime is 678298913. The reversal of 678298905 is 509892876.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 414203904 + 264095001 = 20352^2 + 16251^2 .

It is not a de Polignac number, because 678298905 - 2¹ = 678298903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678298903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7536610 + ... + 7536699.

It is an arithmetic number, because the mean of its divisors is an integer number (97976515).

Almost surely, 2^678298905 is an apocalyptic number.

It is an amenable number.

678298905 is a deficient number, since it is larger than the sum of its proper divisors (497419275).

678298905 is a wasteful number, since it uses less digits than its factorization.

678298905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15073320 (or 15073317 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 678298905 is about 26044.1721888026. The cubic root of 678298905 is about 878.6320451647.

The spelling of 678298905 in words is "six hundred seventy-eight million, two hundred ninety-eight thousand, nine hundred five".