678081678 has 16 divisors (see below), whose sum is σ = 1359863040. Its totient is φ = 225410616.

The previous prime is 678081667. The next prime is 678081689. The reversal of 678081678 is 876180876.

It is an interprime number because it is at equal distance from previous prime (678081667) and next prime (678081689).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 678081678.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151768 + ... + 156171.

It is an arithmetic number, because the mean of its divisors is an integer number (84991440).

Almost surely, 2^678081678 is an apocalyptic number.

678081678 is an abundant number, since it is smaller than the sum of its proper divisors (681781362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678081678 is a wasteful number, since it uses less digits than its factorization.

678081678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308311.

The product of its (nonzero) digits is 903168, while the sum is 51.

The square root of 678081678 is about 26040.0014976958. The cubic root of 678081678 is about 878.5382404128.

The spelling of 678081678 in words is "six hundred seventy-eight million, eighty-one thousand, six hundred seventy-eight".