6561264 has 20 divisors (see below), whose sum is σ = 16950056. Its totient is φ = 2187072.

The previous prime is 6561259. The next prime is 6561277. The reversal of 6561264 is 4621656.

6561264 = T₂₂₇ + T₂₂₈ + ... + T₃₇₀.

It is an Ulam number.

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 3 ways as a sum of consecutive naturals, for example, 68299 + ... + 68394.

Almost surely, 2^6561264 is an apocalyptic number.

It is an amenable number.

6561264 is an abundant number, since it is smaller than the sum of its proper divisors (10388792).

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

6561264 is a wasteful number, since it uses less digits than its factorization.

6561264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136704 (or 136698 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 6561264 is about 2561.4964376317. The cubic root of 6561264 is about 187.2100549789.

It can be divided in two parts, 6 and 561264, that added together give a triangular number (561270 = T₁₀₅₉).

The spelling of 6561264 in words is "six million, five hundred sixty-one thousand, two hundred sixty-four".