681305820384 has 72 divisors (see below), whose sum is σ = 2080416001608. Its totient is φ = 194658804480.

The previous prime is 681305820341. The next prime is 681305820389. The reversal of 681305820384 is 483028503186.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681305820389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72413007 + ... + 72422414.

It is an arithmetic number, because the mean of its divisors is an integer number (28894666689).

Almost surely, 2^681305820384 is an apocalyptic number.

It is an amenable number.

681305820384 is an abundant number, since it is smaller than the sum of its proper divisors (1399110181224).

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

681305820384 is a wasteful number, since it uses less digits than its factorization.

681305820384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144835448 (or 144835433 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 48.

The spelling of 681305820384 in words is "six hundred eighty-one billion, three hundred five million, eight hundred twenty thousand, three hundred eighty-four".