6745640 has 32 divisors (see below), whose sum is σ = 16558560. Its totient is φ = 2452800.

The previous prime is 6745633. The next prime is 6745643. The reversal of 6745640 is 465476.

It is a junction number, because it is equal to n+sod(n) for n = 6745597 and 6745606.

It is not an unprimeable number, because it can be changed into a prime (6745643) 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, 7226 + ... + 8105.

It is an arithmetic number, because the mean of its divisors is an integer number (517455).

Almost surely, 2^6745640 is an apocalyptic number.

It is an amenable number.

6745640 is an abundant number, since it is smaller than the sum of its proper divisors (9812920).

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

6745640 is a wasteful number, since it uses less digits than its factorization.

6745640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15353 (or 15349 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 6745640 is about 2597.2369934220. The cubic root of 6745640 is about 188.9474579365.

The spelling of 6745640 in words is "six million, seven hundred forty-five thousand, six hundred forty".