681376216 has 24 divisors (see below), whose sum is σ = 1294250580. Its totient is φ = 336251168.

The previous prime is 681376207. The next prime is 681376229. The reversal of 681376216 is 612673186.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 672126 + ... + 673138.

Almost surely, 2^681376216 is an apocalyptic number.

It is an amenable number.

681376216 is a deficient number, since it is larger than the sum of its proper divisors (612874364).

681376216 is an equidigital number, since it uses as much as digits as its factorization.

681376216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115 (or 1098 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 681376216 is about 26103.1840203451. The cubic root of 681376216 is about 879.9587687293.

The spelling of 681376216 in words is "six hundred eighty-one million, three hundred seventy-six thousand, two hundred sixteen".