678978105 has 32 divisors (see below), whose sum is σ = 1173070080. Its totient is φ = 333369600.

The previous prime is 678978059. The next prime is 678978107. The reversal of 678978105 is 501879876.

It is not a de Polignac number, because 678978105 - 2¹⁰ = 678977081 is a prime.

It is a super-2 number, since 2×678978105² = 922022534138782050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (678978107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71380 + ... + 80330.

It is an arithmetic number, because the mean of its divisors is an integer number (36658440).

Almost surely, 2^678978105 is an apocalyptic number.

678978105 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

678978105 is a deficient number, since it is larger than the sum of its proper divisors (494091975).

678978105 is a wasteful number, since it uses less digits than its factorization.

678978105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9361.

The product of its (nonzero) digits is 846720, while the sum is 51.

The square root of 678978105 is about 26057.2083117129. The cubic root of 678978105 is about 878.9252137589.

The spelling of 678978105 in words is "six hundred seventy-eight million, nine hundred seventy-eight thousand, one hundred five".