1678681306 has 4 divisors (see below), whose sum is σ = 2518021962. Its totient is φ = 839340652.

The previous prime is 1678681283. The next prime is 1678681313. The reversal of 1678681306 is 6031868761.

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., 1225630081 + 453051225 = 35009^2 + 21285^2 .

It is a super-2 number, since 2×1678681306² = 5635941854227731272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419670325 + ... + 419670328.

Almost surely, 2^1678681306 is an apocalyptic number.

1678681306 is a deficient number, since it is larger than the sum of its proper divisors (839340656).

1678681306 is an equidigital number, since it uses as much as digits as its factorization.

1678681306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839340655.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 1678681306 is about 40971.7134862578. The cubic root of 1678681306 is about 1188.4732688881.

The spelling of 1678681306 in words is "one billion, six hundred seventy-eight million, six hundred eighty-one thousand, three hundred six".