6400647 has 32 divisors (see below), whose sum is σ = 10805760. Its totient is φ = 3706560.

The previous prime is 6400637. The next prime is 6400657. The reversal of 6400647 is 7460046.

It is an interprime number because it is at equal distance from previous prime (6400637) and next prime (6400657).

It is not a de Polignac number, because 6400647 - 2⁸ = 6400391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 6400647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6363 + ... + 7299.

It is an arithmetic number, because the mean of its divisors is an integer number (337680).

Almost surely, 2^6400647 is an apocalyptic number.

6400647 is a deficient number, since it is larger than the sum of its proper divisors (4405113).

6400647 is a wasteful number, since it uses less digits than its factorization.

6400647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 6400647 is about 2529.9499995059. The cubic root of 6400647 is about 185.6698096086.

The spelling of 6400647 in words is "six million, four hundred thousand, six hundred forty-seven".