681702876408 has 128 divisors (see below), whose sum is σ = 1845242081280. Its totient is φ = 209252229120.

The previous prime is 681702876401. The next prime is 681702876433. The reversal of 681702876408 is 804678207186.

It is a happy number.

681702876408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 825653²-1.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681702876401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3199410 + ... + 3405822.

It is an arithmetic number, because the mean of its divisors is an integer number (14415953760).

Almost surely, 2^681702876408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681702876408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922621040640).

681702876408 is an abundant number, since it is smaller than the sum of its proper divisors (1163539204872).

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

681702876408 is a wasteful number, since it uses less digits than its factorization.

681702876408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206669 (or 206665 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 57.

The spelling of 681702876408 in words is "six hundred eighty-one billion, seven hundred two million, eight hundred seventy-six thousand, four hundred eight".