6840640387 has 8 divisors (see below), whose sum is σ = 8277749856. Its totient is φ = 5518499712.

The previous prime is 6840640369. The next prime is 6840640393. The reversal of 6840640387 is 7830460486.

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 6840640387 - 2⁷ = 6840640259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6840640087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28742068 + ... + 28742305.

It is an arithmetic number, because the mean of its divisors is an integer number (1034718732).

Almost surely, 2^6840640387 is an apocalyptic number.

6840640387 is a deficient number, since it is larger than the sum of its proper divisors (1437109469).

6840640387 is a wasteful number, since it uses less digits than its factorization.

6840640387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57484397.

The product of its (nonzero) digits is 774144, while the sum is 46.

The square root of 6840640387 is about 82708.1639682565. The cubic root of 6840640387 is about 1898.3032300484.

The spelling of 6840640387 in words is "six billion, eight hundred forty million, six hundred forty thousand, three hundred eighty-seven".