681061864 has 32 divisors (see below), whose sum is σ = 1493363520. Its totient is φ = 285094656.

The previous prime is 681061861. The next prime is 681061873. The reversal of 681061864 is 468160186.

It is not an unprimeable number, because it can be changed into a prime (681061861) 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 7 ways as a sum of consecutive naturals, for example, 139009 + ... + 143824.

It is an arithmetic number, because the mean of its divisors is an integer number (46667610).

Almost surely, 2^681061864 is an apocalyptic number.

It is an amenable number.

681061864 is an abundant number, since it is smaller than the sum of its proper divisors (812301656).

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

681061864 is a wasteful number, since it uses less digits than its factorization.

681061864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282889 (or 282885 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 681061864 is about 26097.1619912971. The cubic root of 681061864 is about 879.8234253159.

The spelling of 681061864 in words is "six hundred eighty-one million, sixty-one thousand, eight hundred sixty-four".