681285160 has 24 divisors (see below), whose sum is σ = 1533263130. Its totient is φ = 272448032.

The previous prime is 681285133. The next prime is 681285167. The reversal of 681285160 is 61582186.

It can be written as a sum of positive squares in only one way, i.e., 613156644 + 68128516 = 24762^2 + 8254^2 .

It is not an unprimeable number, because it can be changed into a prime (681285167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163017 + ... + 167143.

Almost surely, 2^681285160 is an apocalyptic number.

It is an amenable number.

681285160 is an abundant number, since it is smaller than the sum of its proper divisors (851977970).

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

681285160 is an frugal number, since it uses more digits than its factorization.

681285160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8265 (or 4134 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 681285160 is about 26101.4398070298. The cubic root of 681285160 is about 879.9195690952.

Multiplying 681285160 by its product of nonzero digits (23040), we get a square (15696810086400 = 3961920²).

The spelling of 681285160 in words is "six hundred eighty-one million, two hundred eighty-five thousand, one hundred sixty".