6645378 has 16 divisors (see below), whose sum is σ = 13317696. Its totient is φ = 2210640.

The previous prime is 6645341. The next prime is 6645389. The reversal of 6645378 is 8735466.

It is a super-2 number, since 2×6645378² = 88322097525768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3643 + ... + 5153.

It is an arithmetic number, because the mean of its divisors is an integer number (832356).

Almost surely, 2^6645378 is an apocalyptic number.

6645378 is an abundant number, since it is smaller than the sum of its proper divisors (6672318).

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

6645378 is a wasteful number, since it uses less digits than its factorization.

6645378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249.

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

The square root of 6645378 is about 2577.8630685124. The cubic root of 6645378 is about 188.0066581315.

The spelling of 6645378 in words is "six million, six hundred forty-five thousand, three hundred seventy-eight".