681940996 has 27 divisors (see below), whose sum is σ = 1312856167. Its totient is φ = 309712040.

The previous prime is 681940979. The next prime is 681940997. The reversal of 681940996 is 699049186.

The square root of 681940996 is 26114.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681940997) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 573915 + ... + 575101.

Almost surely, 2^681940996 is an apocalyptic number.

681940996 is the 26114-th square number.

It is an amenable number.

681940996 is a deficient number, since it is larger than the sum of its proper divisors (630915171).

681940996 is a wasteful number, since it uses less digits than its factorization.

681940996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400 (or 1200 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 52.

The cubic root of 681940996 is about 880.2018287069.

The spelling of 681940996 in words is "six hundred eighty-one million, nine hundred forty thousand, nine hundred ninety-six".