681271778 has 16 divisors (see below), whose sum is σ = 1118931840. Its totient is φ = 308523600.

The previous prime is 681271777. The next prime is 681271783. The reversal of 681271778 is 877172186.

It is not an unprimeable number, because it can be changed into a prime (681271777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51173 + ... + 63096.

It is an arithmetic number, because the mean of its divisors is an integer number (69933240).

Almost surely, 2^681271778 is an apocalyptic number.

681271778 is a deficient number, since it is larger than the sum of its proper divisors (437660062).

681271778 is a wasteful number, since it uses less digits than its factorization.

681271778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114553.

The product of its digits is 263424, while the sum is 47.

The square root of 681271778 is about 26101.1834597591. The cubic root of 681271778 is about 879.9138078460.

The spelling of 681271778 in words is "six hundred eighty-one million, two hundred seventy-one thousand, seven hundred seventy-eight".