681008140 has 24 divisors (see below), whose sum is σ = 1432215792. Its totient is φ = 272003520.

The previous prime is 681008137. The next prime is 681008143. The reversal of 681008140 is 41800186.

It is an interprime number because it is at equal distance from previous prime (681008137) and next prime (681008143).

It is a junction number, because it is equal to n+sod(n) for n = 681008099 and 681008108.

It is not an unprimeable number, because it can be changed into a prime (681008143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10819 + ... + 38458.

It is an arithmetic number, because the mean of its divisors is an integer number (59675658).

Almost surely, 2^681008140 is an apocalyptic number.

It is an amenable number.

681008140 is an abundant number, since it is smaller than the sum of its proper divisors (751207652).

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

681008140 is a wasteful number, since it uses less digits than its factorization.

681008140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49977 (or 49975 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 681008140 is about 26096.1326636726. The cubic root of 681008140 is about 879.8002904246.

The spelling of 681008140 in words is "six hundred eighty-one million, eight thousand, one hundred forty".