681989160 has 128 divisors (see below), whose sum is σ = 2100919680. Its totient is φ = 177036288.

The previous prime is 681989093. The next prime is 681989167. The reversal of 681989160 is 61989186.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (681989167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 998179 + ... + 998861.

It is an arithmetic number, because the mean of its divisors is an integer number (16413435).

Almost surely, 2^681989160 is an apocalyptic number.

681989160 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 681989160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1050459840).

681989160 is an abundant number, since it is smaller than the sum of its proper divisors (1418930520).

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

681989160 is a wasteful number, since it uses less digits than its factorization.

681989160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907 (or 903 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 681989160 is about 26114.9221710500. The cubic root of 681989160 is about 880.2225504619. Note that the first 3 decimals are identical.

The spelling of 681989160 in words is "six hundred eighty-one million, nine hundred eighty-nine thousand, one hundred sixty".