6561804 has 24 divisors (see below), whose sum is σ = 15685488. Its totient is φ = 2133760.

The previous prime is 6561791. The next prime is 6561809. The reversal of 6561804 is 4081656.

6561804 is a modest number, since divided by 1804 gives 656 as remainder.

It is not an unprimeable number, because it can be changed into a prime (6561809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6177 + ... + 7160.

It is an arithmetic number, because the mean of its divisors is an integer number (653562).

Almost surely, 2^6561804 is an apocalyptic number.

It is an amenable number.

6561804 is an abundant number, since it is smaller than the sum of its proper divisors (9123684).

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

6561804 is a wasteful number, since it uses less digits than its factorization.

6561804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13385 (or 13383 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 6561804 is about 2561.6018425977. The cubic root of 6561804 is about 187.2151907097.

The spelling of 6561804 in words is "six million, five hundred sixty-one thousand, eight hundred four".