681228512 has 24 divisors (see below), whose sum is σ = 1346171400. Its totient is φ = 339343744.

The previous prime is 681228511. The next prime is 681228529. The reversal of 681228512 is 215822186.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681228511) 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, 30962 + ... + 48177.

It is an arithmetic number, because the mean of its divisors is an integer number (56090475).

Almost surely, 2^681228512 is an apocalyptic number.

It is an amenable number.

681228512 is a deficient number, since it is larger than the sum of its proper divisors (664942888).

681228512 is a wasteful number, since it uses less digits than its factorization.

681228512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79418 (or 79410 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 681228512 is about 26100.3546336060. The cubic root of 681228512 is about 879.8951803526.

The spelling of 681228512 in words is "six hundred eighty-one million, two hundred twenty-eight thousand, five hundred twelve".