681195616 has 24 divisors (see below), whose sum is σ = 1387350720. Its totient is φ = 328852608.

The previous prime is 681195589. The next prime is 681195629. The reversal of 681195616 is 616591186.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 366096 + ... + 367951.

It is an arithmetic number, because the mean of its divisors is an integer number (57806280).

Almost surely, 2^681195616 is an apocalyptic number.

It is an amenable number.

681195616 is an abundant number, since it is smaller than the sum of its proper divisors (706155104).

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

681195616 is a wasteful number, since it uses less digits than its factorization.

681195616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734086 (or 734078 counting only the distinct ones).

The product of its digits is 77760, while the sum is 43.

The square root of 681195616 is about 26099.7244429898. The cubic root of 681195616 is about 879.8810169711.

The spelling of 681195616 in words is "six hundred eighty-one million, one hundred ninety-five thousand, six hundred sixteen".