678009730 has 8 divisors (see below), whose sum is σ = 1220417532. Its totient is φ = 271203888.

The previous prime is 678009721. The next prime is 678009791. The reversal of 678009730 is 37900876.

It can be written as a sum of positive squares in 2 ways, for example, as 665485209 + 12524521 = 25797^2 + 3539^2 .

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, 33900477 + ... + 33900496.

Almost surely, 2^678009730 is an apocalyptic number.

678009730 is a deficient number, since it is larger than the sum of its proper divisors (542407802).

678009730 is a wasteful number, since it uses less digits than its factorization.

678009730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67800980.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 678009730 is about 26038.6199711121. The cubic root of 678009730 is about 878.5071668184.

The spelling of 678009730 in words is "six hundred seventy-eight million, nine thousand, seven hundred thirty".