1678297986 has 24 divisors (see below), whose sum is σ = 3637237500. Its totient is φ = 559290336.

The previous prime is 1678297981. The next prime is 1678297993. The reversal of 1678297986 is 6897928761.

It can be written as a sum of positive squares in 2 ways, for example, as 1641465225 + 36832761 = 40515^2 + 6069^2 .

It is not an unprimeable number, because it can be changed into a prime (1678297981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80140 + ... + 98888.

Almost surely, 2^1678297986 is an apocalyptic number.

1678297986 is an abundant number, since it is smaller than the sum of its proper divisors (1958939514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1678297986 is a wasteful number, since it uses less digits than its factorization.

1678297986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23730 (or 23727 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 63.

The square root of 1678297986 is about 40967.0353577117. The cubic root of 1678297986 is about 1188.3828010009.

The spelling of 1678297986 in words is "one billion, six hundred seventy-eight million, two hundred ninety-seven thousand, nine hundred eighty-six".