681306810 has 32 divisors (see below), whose sum is σ = 1657540800. Its totient is φ = 179192448.

The previous prime is 681306803. The next prime is 681306811. The reversal of 681306810 is 18603186.

It is a super-2 number, since 2×681306810² = 928357938704752200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681306811) 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 15 ways as a sum of consecutive naturals, for example, 153360 + ... + 157739.

It is an arithmetic number, because the mean of its divisors is an integer number (51798150).

Almost surely, 2^681306810 is an apocalyptic number.

681306810 is an abundant number, since it is smaller than the sum of its proper divisors (976233990).

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

681306810 is a wasteful number, since it uses less digits than its factorization.

681306810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311182.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 681306810 is about 26101.8545318144. The cubic root of 681306810 is about 879.9288897429.

Adding to 681306810 its reverse (18603186), we get a palindrome (699909996).

The spelling of 681306810 in words is "six hundred eighty-one million, three hundred six thousand, eight hundred ten".