6645740 has 12 divisors (see below), whose sum is σ = 13956096. Its totient is φ = 2658288.

The previous prime is 6645739. The next prime is 6645757. The reversal of 6645740 is 475466.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6645697 and 6645706.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166124 + ... + 166163.

It is an arithmetic number, because the mean of its divisors is an integer number (1163008).

Almost surely, 2^6645740 is an apocalyptic number.

It is an amenable number.

6645740 is an abundant number, since it is smaller than the sum of its proper divisors (7310356).

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

6645740 is a wasteful number, since it uses less digits than its factorization.

6645740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332296 (or 332294 counting only the distinct ones).

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

The square root of 6645740 is about 2577.9332807503. The cubic root of 6645740 is about 188.0100718914.

The spelling of 6645740 in words is "six million, six hundred forty-five thousand, seven hundred forty".