6826640 has 20 divisors (see below), whose sum is σ = 15872124. Its totient is φ = 2730624.

The previous prime is 6826621. The next prime is 6826657. The reversal of 6826640 is 466286.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2298256 + 4528384 = 1516^2 + 2128^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 6826597 and 6826606.

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, 42587 + ... + 42746.

Almost surely, 2^6826640 is an apocalyptic number.

It is an amenable number.

6826640 is an abundant number, since it is smaller than the sum of its proper divisors (9045484).

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

6826640 is a wasteful number, since it uses less digits than its factorization.

6826640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85346 (or 85340 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 6826640 is about 2612.7839558601. The cubic root of 6826640 is about 189.7007292327.

The spelling of 6826640 in words is "six million, eight hundred twenty-six thousand, six hundred forty".