6745840 has 80 divisors (see below), whose sum is σ = 16793568. Its totient is φ = 2515968.

The previous prime is 6745829. The next prime is 6745841. The reversal of 6745840 is 485476.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 6745796 and 6745805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6745841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127254 + ... + 127306.

Almost surely, 2^6745840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6745840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8396784).

6745840 is an abundant number, since it is smaller than the sum of its proper divisors (10047728).

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

6745840 is a wasteful number, since it uses less digits than its factorization.

6745840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 6745840 is about 2597.2754955915. The cubic root of 6745840 is about 188.9493252719.

The spelling of 6745840 in words is "six million, seven hundred forty-five thousand, eight hundred forty".