681986312 has 36 divisors (see below), whose sum is σ = 1488624255. Its totient is φ = 292058256.

The previous prime is 681986303. The next prime is 681986387. The reversal of 681986312 is 213689186.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 340993156 + 340993156 = 18466^2 + 18466^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18466.

It is a super-2 number, since 2×681986312² = 930210659510722688, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 516389 + ... + 517707.

Almost surely, 2^681986312 is an apocalyptic number.

It is an amenable number.

681986312 is an abundant number, since it is smaller than the sum of its proper divisors (806637943).

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

681986312 is an equidigital number, since it uses as much as digits as its factorization.

681986312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2658 (or 1328 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 681986312 is about 26114.8676427816. The cubic root of 681986312 is about 880.2213251847.

The spelling of 681986312 in words is "six hundred eighty-one million, nine hundred eighty-six thousand, three hundred twelve".