6820785648 has 30 divisors (see below), whose sum is σ = 19088726904. Its totient is φ = 2273595168.

The previous prime is 6820785641. The next prime is 6820785659. The reversal of 6820785648 is 8465870286.

6820785648 is a `hidden beast` number, since 6 + 8 + 2 + 0 + 78 + 564 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 6820785594 and 6820785603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6820785641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23683140 + ... + 23683427.

Almost surely, 2^6820785648 is an apocalyptic number.

It is an amenable number.

6820785648 is an abundant number, since it is smaller than the sum of its proper divisors (12267941256).

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

6820785648 is a wasteful number, since it uses less digits than its factorization.

6820785648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47366581 (or 47366572 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 54.

The square root of 6820785648 is about 82588.0478519743. The cubic root of 6820785648 is about 1896.4648622480.

The spelling of 6820785648 in words is "six billion, eight hundred twenty million, seven hundred eighty-five thousand, six hundred forty-eight".