6685740 has 60 divisors (see below), whose sum is σ = 20978496. Its totient is φ = 1782432.

The previous prime is 6685717. The next prime is 6685741. The reversal of 6685740 is 475866.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6685695 and 6685704.

It is not an unprimeable number, because it can be changed into a prime (6685741) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 444 + ... + 3683.

Almost surely, 2^6685740 is an apocalyptic number.

6685740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6685740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10489248).

6685740 is an abundant number, since it is smaller than the sum of its proper divisors (14292756).

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

6685740 is a wasteful number, since it uses less digits than its factorization.

6685740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148 (or 4137 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 6685740 is about 2585.6797945608. The cubic root of 6685740 is about 188.3865218156.

The spelling of 6685740 in words is "six million, six hundred eighty-five thousand, seven hundred forty".