681969328 has 40 divisors (see below), whose sum is σ = 1333310000. Its totient is φ = 337906944.

The previous prime is 681969313. The next prime is 681969329. The reversal of 681969328 is 823969186.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (681969329) 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 7 ways as a sum of consecutive naturals, for example, 1366423 + ... + 1366921.

It is an arithmetic number, because the mean of its divisors is an integer number (33332750).

Almost surely, 2^681969328 is an apocalyptic number.

It is an amenable number.

681969328 is a deficient number, since it is larger than the sum of its proper divisors (651340672).

681969328 is a wasteful number, since it uses less digits than its factorization.

681969328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109 (or 1103 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 52.

The square root of 681969328 is about 26114.5424620076. The cubic root of 681969328 is about 880.2140181940.

The spelling of 681969328 in words is "six hundred eighty-one million, nine hundred sixty-nine thousand, three hundred twenty-eight".