681755660 has 24 divisors (see below), whose sum is σ = 1432840416. Its totient is φ = 272482560.

The previous prime is 681755653. The next prime is 681755677. The reversal of 681755660 is 66557186.

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, 12980 + ... + 39140.

It is an arithmetic number, because the mean of its divisors is an integer number (59701684).

Almost surely, 2^681755660 is an apocalyptic number.

It is an amenable number.

681755660 is an abundant number, since it is smaller than the sum of its proper divisors (751084756).

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

681755660 is a wasteful number, since it uses less digits than its factorization.

681755660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27473 (or 27471 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 681755660 is about 26110.4511642369. The cubic root of 681755660 is about 880.1220818921.

The spelling of 681755660 in words is "six hundred eighty-one million, seven hundred fifty-five thousand, six hundred sixty".