6656872 has 8 divisors (see below), whose sum is σ = 12481650. Its totient is φ = 3328432.

The previous prime is 6656861. The next prime is 6656879. The reversal of 6656872 is 2786566.

It can be written as a sum of positive squares in only one way, i.e., 6522916 + 133956 = 2554^2 + 366^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (6656879) 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 as a sum of consecutive naturals, namely, 416047 + ... + 416062.

Almost surely, 2^6656872 is an apocalyptic number.

It is an amenable number.

6656872 is a deficient number, since it is larger than the sum of its proper divisors (5824778).

6656872 is a wasteful number, since it uses less digits than its factorization.

6656872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832115 (or 832111 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 6656872 is about 2580.0914712467. The cubic root of 6656872 is about 188.1149892577.

The spelling of 6656872 in words is "six million, six hundred fifty-six thousand, eight hundred seventy-two".