678739659 has 12 divisors (see below), whose sum is σ = 979956216. Its totient is φ = 417685632.

The previous prime is 678739651. The next prime is 678739669. The reversal of 678739659 is 956937876.

It is not a de Polignac number, because 678739659 - 2³ = 678739651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678739651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 668862 + ... + 669875.

It is an arithmetic number, because the mean of its divisors is an integer number (81663018).

Almost surely, 2^678739659 is an apocalyptic number.

678739659 is a deficient number, since it is larger than the sum of its proper divisors (301216557).

678739659 is a wasteful number, since it uses less digits than its factorization.

678739659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338766 (or 1338753 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 60.

The square root of 678739659 is about 26052.6324773525. The cubic root of 678739659 is about 878.8223136615.

The spelling of 678739659 in words is "six hundred seventy-eight million, seven hundred thirty-nine thousand, six hundred fifty-nine".