678890117890 has 8 divisors (see below), whose sum is σ = 1222002212220. Its totient is φ = 271556047152.

The previous prime is 678890117863. The next prime is 678890117953. The reversal of 678890117890 is 98711098876.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 675662628169 + 3227489721 = 821987^2 + 56811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 33944505885 + ... + 33944505904.

Almost surely, 2^678890117890 is an apocalyptic number.

678890117890 is a deficient number, since it is larger than the sum of its proper divisors (543112094330).

678890117890 is a wasteful number, since it uses less digits than its factorization.

678890117890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67889011796.

The product of its (nonzero) digits is 12192768, while the sum is 64.

The spelling of 678890117890 in words is "six hundred seventy-eight billion, eight hundred ninety million, one hundred seventeen thousand, eight hundred ninety".