6845640 has 32 divisors (see below), whose sum is σ = 20537280. Its totient is φ = 1825472.

The previous prime is 6845633. The next prime is 6845659. The reversal of 6845640 is 465486.

It is a happy number.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 28404 + ... + 28643.

It is an arithmetic number, because the mean of its divisors is an integer number (641790).

Almost surely, 2^6845640 is an apocalyptic number.

6845640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6845640 is an abundant number, since it is smaller than the sum of its proper divisors (13691640).

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

6845640 is a wasteful number, since it uses less digits than its factorization.

6845640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57061 (or 57057 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 6845640 is about 2616.4173978935. The cubic root of 6845640 is about 189.8765587846.

The spelling of 6845640 in words is "six million, eight hundred forty-five thousand, six hundred forty".