6745644 has 18 divisors (see below), whose sum is σ = 17051580. Its totient is φ = 2248536.

The previous prime is 6745643. The next prime is 6745657. The reversal of 6745644 is 4465476.

6745644 is a `hidden beast` number, since 6 + 7 + 4 + 5 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 187379 = 6745644 / (6 + 7 + 4 + 5 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 6745599 and 6745608.

It is not an unprimeable number, because it can be changed into a prime (6745643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93654 + ... + 93725.

It is an arithmetic number, because the mean of its divisors is an integer number (947310).

Almost surely, 2^6745644 is an apocalyptic number.

It is an amenable number.

6745644 is an abundant number, since it is smaller than the sum of its proper divisors (10305936).

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

6745644 is a wasteful number, since it uses less digits than its factorization.

6745644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187389 (or 187384 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 6745644 is about 2597.2377634710. The cubic root of 6745644 is about 188.9474952835.

The spelling of 6745644 in words is "six million, seven hundred forty-five thousand, six hundred forty-four".