6561478 has 32 divisors (see below), whose sum is σ = 12400128. Its totient is φ = 2529600.

The previous prime is 6561461. The next prime is 6561481. The reversal of 6561478 is 8741656.

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

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 20943 + ... + 21253.

It is an arithmetic number, because the mean of its divisors is an integer number (387504).

Almost surely, 2^6561478 is an apocalyptic number.

6561478 is a deficient number, since it is larger than the sum of its proper divisors (5838650).

6561478 is a wasteful number, since it uses less digits than its factorization.

6561478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468.

The product of its digits is 40320, while the sum is 37.

The square root of 6561478 is about 2561.5382097482. The cubic root of 6561478 is about 187.2120902837.

The spelling of 6561478 in words is "six million, five hundred sixty-one thousand, four hundred seventy-eight".