6400780647 has 16 divisors (see below), whose sum is σ = 8574348288. Its totient is φ = 4247229600.

The previous prime is 6400780621. The next prime is 6400780657. The reversal of 6400780647 is 7460870046.

It is not a de Polignac number, because 6400780647 - 2³⁰ = 5327038823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6400780599 and 6400780608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400780657) 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 15 ways as a sum of consecutive naturals, for example, 1119897 + ... + 1125597.

It is an arithmetic number, because the mean of its divisors is an integer number (535896768).

Almost surely, 2^6400780647 is an apocalyptic number.

6400780647 is a deficient number, since it is larger than the sum of its proper divisors (2173567641).

6400780647 is a wasteful number, since it uses less digits than its factorization.

6400780647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7390.

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 6400780647 is about 80004.8788949774. The cubic root of 6400780647 is about 1856.7110187594.

The spelling of 6400780647 in words is "six billion, four hundred million, seven hundred eighty thousand, six hundred forty-seven".