681380728044 has 24 divisors (see below), whose sum is σ = 1593893133168. Its totient is φ = 226554799680.

The previous prime is 681380728037. The next prime is 681380728111. The reversal of 681380728044 is 440827083186.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71508747 + ... + 71518274.

It is an arithmetic number, because the mean of its divisors is an integer number (66412213882).

Almost surely, 2^681380728044 is an apocalyptic number.

It is an amenable number.

681380728044 is an abundant number, since it is smaller than the sum of its proper divisors (912512405124).

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

681380728044 is a wasteful number, since it uses less digits than its factorization.

681380728044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143027425 (or 143027423 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 51.

The spelling of 681380728044 in words is "six hundred eighty-one billion, three hundred eighty million, seven hundred twenty-eight thousand, forty-four".