681247968 has 96 divisors (see below), whose sum is σ = 1853913600. Its totient is φ = 218889216.

The previous prime is 681247967. The next prime is 681247969. The reversal of 681247968 is 869742186.

It is an interprime number because it is at equal distance from previous prime (681247967) and next prime (681247969).

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 681247968.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681247967) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 325068 + ... + 327156.

It is an arithmetic number, because the mean of its divisors is an integer number (19311600).

Almost surely, 2^681247968 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 681247968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (926956800).

681247968 is an abundant number, since it is smaller than the sum of its proper divisors (1172665632).

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

681247968 is a wasteful number, since it uses less digits than its factorization.

681247968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224 (or 2216 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The square root of 681247968 is about 26100.7273461871. The cubic root of 681247968 is about 879.9035569239.

The spelling of 681247968 in words is "six hundred eighty-one million, two hundred forty-seven thousand, nine hundred sixty-eight".