681980544 has 192 divisors, whose sum is σ = 2340973440. Its totient is φ = 186329088.

The previous prime is 681980531. The next prime is 681980591. The reversal of 681980544 is 445089186.

It is a tau number, because it is divible by the number of its divisors (192).

It is a self number, because there is not a number n which added to its sum of digits gives 681980544.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 183634 + ... + 187310.

It is an arithmetic number, because the mean of its divisors is an integer number (12192570).

Almost surely, 2^681980544 is an apocalyptic number.

681980544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681980544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1170486720).

681980544 is an abundant number, since it is smaller than the sum of its proper divisors (1658992896).

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

681980544 is a wasteful number, since it uses less digits than its factorization.

681980544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3727 (or 3712 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 681980544 is about 26114.7572073722. The cubic root of 681980544 is about 880.2188436438.

The spelling of 681980544 in words is "six hundred eighty-one million, nine hundred eighty thousand, five hundred forty-four".