6561678 has 32 divisors (see below), whose sum is σ = 13554432. Its totient is φ = 2116800.

The previous prime is 6561673. The next prime is 6561679. The reversal of 6561678 is 8761656.

6561678 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

Its product of digits (60480) is a multiple of the sum of its prime divisors (360).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30993 + ... + 31203.

It is an arithmetic number, because the mean of its divisors is an integer number (423576).

Almost surely, 2^6561678 is an apocalyptic number.

6561678 is an abundant number, since it is smaller than the sum of its proper divisors (6992754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6561678 is a wasteful number, since it uses less digits than its factorization.

6561678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360.

The product of its digits is 60480, while the sum is 39.

The square root of 6561678 is about 2561.5772484936. The cubic root of 6561678 is about 187.2139923977.

The spelling of 6561678 in words is "six million, five hundred sixty-one thousand, six hundred seventy-eight".