6840387057 has 64 divisors (see below), whose sum is σ = 10930028544. Its totient is φ = 3723347520.

The previous prime is 6840387023. The next prime is 6840387061. The reversal of 6840387057 is 7507830486.

It is not a de Polignac number, because 6840387057 - 2¹¹ = 6840385009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6840386997 and 6840387015.

It is not an unprimeable number, because it can be changed into a prime (6840387157) 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 63 ways as a sum of consecutive naturals, for example, 19712758 + ... + 19713104.

It is an arithmetic number, because the mean of its divisors is an integer number (170781696).

Almost surely, 2^6840387057 is an apocalyptic number.

It is an amenable number.

6840387057 is a deficient number, since it is larger than the sum of its proper divisors (4089641487).

6840387057 is a wasteful number, since it uses less digits than its factorization.

6840387057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The square root of 6840387057 is about 82706.6324849465. The cubic root of 6840387057 is about 1898.2797964190.

The spelling of 6840387057 in words is "six billion, eight hundred forty million, three hundred eighty-seven thousand, fifty-seven".