681378340 has 12 divisors (see below), whose sum is σ = 1430894556. Its totient is φ = 272551328.

The previous prime is 681378337. The next prime is 681378349. The reversal of 681378340 is 43873186.

It can be written as a sum of positive squares in 2 ways, for example, as 480135744 + 201242596 = 21912^2 + 14186^2 .

It is a junction number, because it is equal to n+sod(n) for n = 681378293 and 681378302.

It is not an unprimeable number, because it can be changed into a prime (681378349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17034439 + ... + 17034478.

It is an arithmetic number, because the mean of its divisors is an integer number (119241213).

Almost surely, 2^681378340 is an apocalyptic number.

It is an amenable number.

681378340 is an abundant number, since it is smaller than the sum of its proper divisors (749516216).

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

681378340 is a wasteful number, since it uses less digits than its factorization.

681378340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34068926 (or 34068924 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 681378340 is about 26103.2247050053. The cubic root of 681378340 is about 879.9596830703.

The spelling of 681378340 in words is "six hundred eighty-one million, three hundred seventy-eight thousand, three hundred forty".