681426386 has 8 divisors (see below), whose sum is σ = 1031185404. Its totient is φ = 337697920.

The previous prime is 681426377. The next prime is 681426391. The reversal of 681426386 is 683624186.

It can be written as a sum of positive squares in 2 ways, for example, as 636603361 + 44823025 = 25231^2 + 6695^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1507355 + ... + 1507806.

Almost surely, 2^681426386 is an apocalyptic number.

681426386 is a deficient number, since it is larger than the sum of its proper divisors (349759018).

681426386 is a wasteful number, since it uses less digits than its factorization.

681426386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015276.

The product of its digits is 331776, while the sum is 44.

The square root of 681426386 is about 26104.1449965326. The cubic root of 681426386 is about 879.9803654366.

The spelling of 681426386 in words is "six hundred eighty-one million, four hundred twenty-six thousand, three hundred eighty-six".