681503600 has 60 divisors (see below), whose sum is σ = 1641464880. Its totient is φ = 271910400.

The previous prime is 681503591. The next prime is 681503611. The reversal of 681503600 is 6305186.

It is a super-3 number, since 3×681503600³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173660 + ... + 177540.

It is an arithmetic number, because the mean of its divisors is an integer number (27357748).

Almost surely, 2^681503600 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 681503600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (820732440).

681503600 is an abundant number, since it is smaller than the sum of its proper divisors (959961280).

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

681503600 is a wasteful number, since it uses less digits than its factorization.

681503600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4338 (or 4327 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 681503600 is about 26105.6239151643. The cubic root of 681503600 is about 880.0136017181.

Adding to 681503600 its reverse (6305186), we get a palindrome (687808786).

The spelling of 681503600 in words is "six hundred eighty-one million, five hundred three thousand, six hundred".