678145216 has 28 divisors (see below), whose sum is σ = 1537937488. Its totient is φ = 290633472.

The previous prime is 678145199. The next prime is 678145231. The reversal of 678145216 is 612541876.

It is a tau number, because it is divible by the number of its divisors (28).

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 756411 + ... + 757306.

Almost surely, 2^678145216 is an apocalyptic number.

It is an amenable number.

678145216 is an abundant number, since it is smaller than the sum of its proper divisors (859792272).

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

678145216 is a wasteful number, since it uses less digits than its factorization.

678145216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513736 (or 1513726 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 678145216 is about 26041.2214767280. The cubic root of 678145216 is about 878.5656799878.

The spelling of 678145216 in words is "six hundred seventy-eight million, one hundred forty-five thousand, two hundred sixteen".