681111180 has 60 divisors (see below), whose sum is σ = 2136676080. Its totient is φ = 181629216.

The previous prime is 681111173. The next prime is 681111181. The reversal of 681111180 is 81111186.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (681111181) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 208600 + ... + 211839.

It is an arithmetic number, because the mean of its divisors is an integer number (35611268).

Almost surely, 2^681111180 is an apocalyptic number.

681111180 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681111180 is an abundant number, since it is smaller than the sum of its proper divisors (1455564900).

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

681111180 is a wasteful number, since it uses less digits than its factorization.

681111180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420460 (or 420449 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 27.

The square root of 681111180 is about 26098.1068278908. The cubic root of 681111180 is about 879.8446609418.

The spelling of 681111180 in words is "six hundred eighty-one million, one hundred eleven thousand, one hundred eighty".