6645738 has 16 divisors (see below), whose sum is σ = 14499936. Its totient is φ = 2013840.

The previous prime is 6645721. The next prime is 6645739. The reversal of 6645738 is 8375466.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6645696 and 6645705.

It is not an unprimeable number, because it can be changed into a prime (6645739) 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, 50281 + ... + 50412.

It is an arithmetic number, because the mean of its divisors is an integer number (906246).

Almost surely, 2^6645738 is an apocalyptic number.

6645738 is an abundant number, since it is smaller than the sum of its proper divisors (7854198).

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

6645738 is a wasteful number, since it uses less digits than its factorization.

6645738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100709.

The product of its digits is 120960, while the sum is 39.

The square root of 6645738 is about 2577.9328928426. The cubic root of 6645738 is about 188.0100530312.

The spelling of 6645738 in words is "six million, six hundred forty-five thousand, seven hundred thirty-eight".