6906645 has 24 divisors (see below), whose sum is σ = 12360192. Its totient is φ = 3564000.

The previous prime is 6906637. The next prime is 6906649. The reversal of 6906645 is 5466096.

It is a happy number.

6906645 is a `hidden beast` number, since 6 + 9 + 0 + 6 + 645 = 666.

It is not a de Polignac number, because 6906645 - 2³ = 6906637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6906649) 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 in 23 ways as a sum of consecutive naturals, for example, 1081 + ... + 3870.

It is an arithmetic number, because the mean of its divisors is an integer number (515008).

Almost surely, 2^6906645 is an apocalyptic number.

It is an amenable number.

6906645 is a deficient number, since it is larger than the sum of its proper divisors (5453547).

6906645 is a wasteful number, since it uses less digits than its factorization.

6906645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993 (or 4990 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 6906645 is about 2628.0496570651. The cubic root of 6906645 is about 190.4389206296.

The spelling of 6906645 in words is "six million, nine hundred six thousand, six hundred forty-five".