681049700 has 18 divisors (see below), whose sum is σ = 1477878066. Its totient is φ = 272419840.

The previous prime is 681049687. The next prime is 681049709. The reversal of 681049700 is 7940186.

It can be written as a sum of positive squares in 3 ways, for example, as 187854436 + 493195264 = 13706^2 + 22208^2 .

It is not an unprimeable number, because it can be changed into a prime (681049709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3405149 + ... + 3405348.

It is an arithmetic number, because the mean of its divisors is an integer number (82104337).

Almost surely, 2^681049700 is an apocalyptic number.

It is an amenable number.

681049700 is an abundant number, since it is smaller than the sum of its proper divisors (796828366).

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

681049700 is a wasteful number, since it uses less digits than its factorization.

681049700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810511 (or 6810504 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 681049700 is about 26096.9289380954. The cubic root of 681049700 is about 879.8181873014.

Adding to 681049700 its reverse (7940186), we get a palindrome (688989886).

The spelling of 681049700 in words is "six hundred eighty-one million, forty-nine thousand, seven hundred".