678455679 has 16 divisors (see below), whose sum is σ = 1029752064. Its totient is φ = 393307200.

The previous prime is 678455639. The next prime is 678455689. The reversal of 678455679 is 976554876.

It is not a de Polignac number, because 678455679 - 2¹⁹ = 677931391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678455639) 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, 446182 + ... + 447699.

It is an arithmetic number, because the mean of its divisors is an integer number (64359504).

Almost surely, 2^678455679 is an apocalyptic number.

678455679 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

678455679 is a deficient number, since it is larger than the sum of its proper divisors (351296385).

678455679 is a wasteful number, since it uses less digits than its factorization.

678455679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893918.

The product of its digits is 12700800, while the sum is 57.

The square root of 678455679 is about 26047.1817861357. The cubic root of 678455679 is about 878.6997321624.

The spelling of 678455679 in words is "six hundred seventy-eight million, four hundred fifty-five thousand, six hundred seventy-nine".