681755648 has 44 divisors (see below), whose sum is σ = 1557554112. Its totient is φ = 292177920.

The previous prime is 681755647. The next prime is 681755653. The reversal of 681755648 is 846557186.

It is a junction number, because it is equal to n+sod(n) for n = 681755596 and 681755605.

It is not an unprimeable number, because it can be changed into a prime (681755647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40388 + ... + 54723.

Almost surely, 2^681755648 is an apocalyptic number.

It is an amenable number.

681755648 is an abundant number, since it is smaller than the sum of its proper divisors (875798464).

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

681755648 is an equidigital number, since it uses as much as digits as its factorization.

681755648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95138 (or 95120 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 50.

The square root of 681755648 is about 26110.4509344439. The cubic root of 681755648 is about 880.1220767282.

The spelling of 681755648 in words is "six hundred eighty-one million, seven hundred fifty-five thousand, six hundred forty-eight".