678939945 has 16 divisors (see below), whose sum is σ = 1087259712. Its totient is φ = 361782720.

The previous prime is 678939929. The next prime is 678939949. The reversal of 678939945 is 549939876.

It is not a de Polignac number, because 678939945 - 2⁴ = 678939929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (678939949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1762 + ... + 36891.

It is an arithmetic number, because the mean of its divisors is an integer number (67953732).

Almost surely, 2^678939945 is an apocalyptic number.

It is an amenable number.

678939945 is a deficient number, since it is larger than the sum of its proper divisors (408319767).

678939945 is a wasteful number, since it uses less digits than its factorization.

678939945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39832.

The product of its digits is 14696640, while the sum is 60.

The square root of 678939945 is about 26056.4760664216. The cubic root of 678939945 is about 878.9087476342.

The spelling of 678939945 in words is "six hundred seventy-eight million, nine hundred thirty-nine thousand, nine hundred forty-five".