681971712 has 208 divisors, whose sum is σ = 2013020160. Its totient is φ = 204374016.

The previous prime is 681971663. The next prime is 681971777. The reversal of 681971712 is 217179186.

Its product of digits (42336) is a multiple of the sum of its prime factors (196).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5369793 + ... + 5369919.

Almost surely, 2^681971712 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 681971712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1006510080).

681971712 is an abundant number, since it is smaller than the sum of its proper divisors (1331048448).

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

681971712 is a wasteful number, since it uses less digits than its factorization.

681971712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 174 counting only the distinct ones).

The product of its digits is 42336, while the sum is 42.

The square root of 681971712 is about 26114.5881070332. The cubic root of 681971712 is about 880.2150438646.

The spelling of 681971712 in words is "six hundred eighty-one million, nine hundred seventy-one thousand, seven hundred twelve".