1381681768 has 32 divisors (see below), whose sum is σ = 2628864000. Its totient is φ = 680726592.

The previous prime is 1381681757. The next prime is 1381681793. The reversal of 1381681768 is 8671861831.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146821 + ... + 155947.

It is an arithmetic number, because the mean of its divisors is an integer number (82152000).

Almost surely, 2^1381681768 is an apocalyptic number.

It is an amenable number.

1381681768 is a deficient number, since it is larger than the sum of its proper divisors (1247182232).

1381681768 is a wasteful number, since it uses less digits than its factorization.

1381681768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9409 (or 9405 counting only the distinct ones).

The product of its digits is 387072, while the sum is 49.

The square root of 1381681768 is about 37170.9801861614. The cubic root of 1381681768 is about 1113.7883620144.

The spelling of 1381681768 in words is "one billion, three hundred eighty-one million, six hundred eighty-one thousand, seven hundred sixty-eight".