1678638366 has 24 divisors (see below), whose sum is σ = 3705675480. Its totient is φ = 548988336.

The previous prime is 1678638347. The next prime is 1678638421. The reversal of 1678638366 is 6638368761.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 878836 + ... + 880743.

It is an arithmetic number, because the mean of its divisors is an integer number (154403145).

Almost surely, 2^1678638366 is an apocalyptic number.

1678638366 is an abundant number, since it is smaller than the sum of its proper divisors (2027037114).

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

1678638366 is a wasteful number, since it uses less digits than its factorization.

1678638366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759640 (or 1759637 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 1678638366 is about 40971.1894628408. The cubic root of 1678638366 is about 1188.4631352439.

The spelling of 1678638366 in words is "one billion, six hundred seventy-eight million, six hundred thirty-eight thousand, three hundred sixty-six".