681543064 has 16 divisors (see below), whose sum is σ = 1278383400. Its totient is φ = 340640832.

The previous prime is 681543013. The next prime is 681543067. The reversal of 681543064 is 460345186.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681543067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7947 + ... + 37765.

Almost surely, 2^681543064 is an apocalyptic number.

It is an amenable number.

681543064 is a deficient number, since it is larger than the sum of its proper divisors (596840336).

681543064 is a wasteful number, since it uses less digits than its factorization.

681543064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32682 (or 32678 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 681543064 is about 26106.3797566802. The cubic root of 681543064 is about 880.0305877798.

The spelling of 681543064 in words is "six hundred eighty-one million, five hundred forty-three thousand, sixty-four".