6781387997 has 8 divisors (see below), whose sum is σ = 7023220992. Its totient is φ = 6543619600.

The previous prime is 6781387993. The next prime is 6781388023. The reversal of 6781387997 is 7997831876.

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

It is a cyclic number.

It is not a de Polignac number, because 6781387997 - 2² = 6781387993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6781387993) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1012754 + ... + 1019427.

It is an arithmetic number, because the mean of its divisors is an integer number (877902624).

Almost surely, 2^6781387997 is an apocalyptic number.

It is an amenable number.

6781387997 is a deficient number, since it is larger than the sum of its proper divisors (241832995).

6781387997 is a wasteful number, since it uses less digits than its factorization.

6781387997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032299.

The product of its digits is 32006016, while the sum is 65.

The square root of 6781387997 is about 82349.1833414273. The cubic root of 6781387997 is about 1892.8064087766.

The spelling of 6781387997 in words is "six billion, seven hundred eighty-one million, three hundred eighty-seven thousand, nine hundred ninety-seven".