678858490 has 8 divisors (see below), whose sum is σ = 1221945300. Its totient is φ = 271543392.

The previous prime is 678858473. The next prime is 678858497. The reversal of 678858490 is 94858876.

It can be written as a sum of positive squares in 2 ways, for example, as 653466969 + 25391521 = 25563^2 + 5039^2 .

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

It is not an unprimeable number, because it can be changed into a prime (678858497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33942915 + ... + 33942934.

Almost surely, 2^678858490 is an apocalyptic number.

678858490 is a deficient number, since it is larger than the sum of its proper divisors (543086810).

678858490 is a wasteful number, since it uses less digits than its factorization.

678858490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67885856.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The square root of 678858490 is about 26054.9129724127. The cubic root of 678858490 is about 878.8735975566.

The spelling of 678858490 in words is "six hundred seventy-eight million, eight hundred fifty-eight thousand, four hundred ninety".