681663372 has 96 divisors (see below), whose sum is σ = 1761177600. Its totient is φ = 203895552.

The previous prime is 681663343. The next prime is 681663379. The reversal of 681663372 is 273366186.

It is not an unprimeable number, because it can be changed into a prime (681663379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1752154 + ... + 1752542.

It is an arithmetic number, because the mean of its divisors is an integer number (18345600).

Almost surely, 2^681663372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681663372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (880588800).

681663372 is an abundant number, since it is smaller than the sum of its proper divisors (1079514228).

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

681663372 is a wasteful number, since it uses less digits than its factorization.

681663372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 693 counting only the distinct ones).

The product of its digits is 217728, while the sum is 42.

The square root of 681663372 is about 26108.6838427371. The cubic root of 681663372 is about 880.0823666017.

The spelling of 681663372 in words is "six hundred eighty-one million, six hundred sixty-three thousand, three hundred seventy-two".