681234570672 has 80 divisors (see below), whose sum is σ = 1855193938560. Its totient is φ = 214811536896.

The previous prime is 681234570641. The next prime is 681234570683. The reversal of 681234570672 is 276075432186.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76068 + ... + 1169724.

It is an arithmetic number, because the mean of its divisors is an integer number (23189924232).

Almost surely, 2^681234570672 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 681234570672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (927596969280).

681234570672 is an abundant number, since it is smaller than the sum of its proper divisors (1173959367888).

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

681234570672 is a wasteful number, since it uses less digits than its factorization.

681234570672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094370 (or 1094364 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 681234570672 in words is "six hundred eighty-one billion, two hundred thirty-four million, five hundred seventy thousand, six hundred seventy-two".