678494507 has 2 divisors, whose sum is σ = 678494508. Its totient is φ = 678494506.

The previous prime is 678494483. The next prime is 678494543. The reversal of 678494507 is 705494876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678494507 - 2¹² = 678490411 is a prime.

It is not a weakly prime, because it can be changed into another prime (678494587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339247253 + 339247254.

It is an arithmetic number, because the mean of its divisors is an integer number (339247254).

Almost surely, 2^678494507 is an apocalyptic number.

678494507 is a deficient number, since it is larger than the sum of its proper divisors (1).

678494507 is an equidigital number, since it uses as much as digits as its factorization.

678494507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The square root of 678494507 is about 26047.9271152236. The cubic root of 678494507 is about 878.7164944966.

The spelling of 678494507 in words is "six hundred seventy-eight million, four hundred ninety-four thousand, five hundred seven".