1668927378 has 8 divisors (see below), whose sum is σ = 3337854768. Its totient is φ = 556309124.

The previous prime is 1668927353. The next prime is 1668927391. The reversal of 1668927378 is 8737298661.

It is a sphenic number, since it is the product of 3 distinct primes.

1668927378 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139077276 + ... + 139077287.

It is an arithmetic number, because the mean of its divisors is an integer number (417231846).

Almost surely, 2^1668927378 is an apocalyptic number.

1668927378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1668927378 is a wasteful number, since it uses less digits than its factorization.

1668927378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278154568.

The product of its digits is 6096384, while the sum is 57.

The square root of 1668927378 is about 40852.5076096927. The cubic root of 1668927378 is about 1186.1669332312.

The spelling of 1668927378 in words is "one billion, six hundred sixty-eight million, nine hundred twenty-seven thousand, three hundred seventy-eight".