678978107 has 2 divisors, whose sum is σ = 678978108. Its totient is φ = 678978106.

The previous prime is 678978059. The next prime is 678978119. The reversal of 678978107 is 701879876.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 678978107 - 2⁶ = 678978043 is a prime.

It is a super-2 number, since 2×678978107² = 922022539570606898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (678978137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339489053 + 339489054.

It is an arithmetic number, because the mean of its divisors is an integer number (339489054).

Almost surely, 2^678978107 is an apocalyptic number.

678978107 is a deficient number, since it is larger than the sum of its proper divisors (1).

678978107 is an equidigital number, since it uses as much as digits as its factorization.

678978107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 53.

The square root of 678978107 is about 26057.2083500900. The cubic root of 678978107 is about 878.9252146219.

The spelling of 678978107 in words is "six hundred seventy-eight million, nine hundred seventy-eight thousand, one hundred seven".