681158532 has 12 divisors (see below), whose sum is σ = 1589369936. Its totient is φ = 227052840.

The previous prime is 681158521. The next prime is 681158537. The reversal of 681158532 is 235851186.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (681158537) 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 3 ways as a sum of consecutive naturals, for example, 28381594 + ... + 28381617.

Almost surely, 2^681158532 is an apocalyptic number.

It is an amenable number.

681158532 is an abundant number, since it is smaller than the sum of its proper divisors (908211404).

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

681158532 is a wasteful number, since it uses less digits than its factorization.

681158532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56763218 (or 56763216 counting only the distinct ones).

The product of its digits is 57600, while the sum is 39.

The square root of 681158532 is about 26099.0140043642. The cubic root of 681158532 is about 879.8650498984.

The spelling of 681158532 in words is "six hundred eighty-one million, one hundred fifty-eight thousand, five hundred thirty-two".