678098 has 4 divisors (see below), whose sum is σ = 1017150. Its totient is φ = 339048.

The previous prime is 678077. The next prime is 678101. The reversal of 678098 is 890876.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 667489 + 10609 = 817^2 + 103^2 .

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678098.

It is an unprimeable number.

678098 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169523 + ... + 169526.

2⁶⁷⁸⁰⁹⁸ is an apocalyptic number.

678098 is a deficient number, since it is larger than the sum of its proper divisors (339052).

678098 is a wasteful number, since it uses less digits than its factorization.

678098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339051.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 678098 is about 823.4670606648. The cubic root of 678098 is about 87.8545289409.

The spelling of 678098 in words is "six hundred seventy-eight thousand, ninety-eight".