681270687840 has 192 divisors, whose sum is σ = 2209866043392. Its totient is φ = 176312217600.

The previous prime is 681270687833. The next prime is 681270687857. The reversal of 681270687840 is 48786072186.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3668259 + ... + 3849501.

It is an arithmetic number, because the mean of its divisors is an integer number (11509718976).

Almost surely, 2^681270687840 is an apocalyptic number.

681270687840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681270687840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104933021696).

681270687840 is an abundant number, since it is smaller than the sum of its proper divisors (1528595355552).

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

681270687840 is a wasteful number, since it uses less digits than its factorization.

681270687840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181493 (or 181485 counting only the distinct ones).

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

The spelling of 681270687840 in words is "six hundred eighty-one billion, two hundred seventy million, six hundred eighty-seven thousand, eight hundred forty".