681468740 has 24 divisors (see below), whose sum is σ = 1431584280. Its totient is φ = 272492288.

The previous prime is 681468737. The next prime is 681468743. The reversal of 681468740 is 47864186.

It is an interprime number because it is at equal distance from previous prime (681468737) and next prime (681468743).

It can be written as a sum of positive squares in 4 ways, for example, as 70291456 + 611177284 = 8384^2 + 24722^2 .

It is a junction number, because it is equal to n+sod(n) for n = 681468691 and 681468700.

It is not an unprimeable number, because it can be changed into a prime (681468743) 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, 92306 + ... + 99414.

It is an arithmetic number, because the mean of its divisors is an integer number (59649345).

Almost surely, 2^681468740 is an apocalyptic number.

It is an amenable number.

681468740 is an abundant number, since it is smaller than the sum of its proper divisors (750115540).

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

681468740 is a wasteful number, since it uses less digits than its factorization.

681468740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11911 (or 11909 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 681468740 is about 26104.9562344012. The cubic root of 681468740 is about 879.9985967608.

The spelling of 681468740 in words is "six hundred eighty-one million, four hundred sixty-eight thousand, seven hundred forty".