1680378978 has 16 divisors (see below), whose sum is σ = 3373254720. Its totient is φ = 558043536.

The previous prime is 1680378913. The next prime is 1680379003. The reversal of 1680378978 is 8798730861.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 518950 + ... + 522177.

It is an arithmetic number, because the mean of its divisors is an integer number (210828420).

Almost surely, 2^1680378978 is an apocalyptic number.

1680378978 is an abundant number, since it is smaller than the sum of its proper divisors (1692875742).

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

1680378978 is a wasteful number, since it uses less digits than its factorization.

1680378978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041401.

The product of its (nonzero) digits is 4064256, while the sum is 57.

The square root of 1680378978 is about 40992.4258613710. The cubic root of 1680378978 is about 1188.8737733420.

The spelling of 1680378978 in words is "one billion, six hundred eighty million, three hundred seventy-eight thousand, nine hundred seventy-eight".