681065208 has 48 divisors (see below), whose sum is σ = 1845815400. Its totient is φ = 226866240.

The previous prime is 681065207. The next prime is 681065219. The reversal of 681065208 is 802560186.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681065207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157783 + ... + 162041.

Almost surely, 2^681065208 is an apocalyptic number.

It is an amenable number.

681065208 is an abundant number, since it is smaller than the sum of its proper divisors (1164750192).

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

681065208 is a wasteful number, since it uses less digits than its factorization.

681065208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6492 (or 6485 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 681065208 is about 26097.2260594876. The cubic root of 681065208 is about 879.8248652853.

The spelling of 681065208 in words is "six hundred eighty-one million, sixty-five thousand, two hundred eight".