681808282 has 4 divisors (see below), whose sum is σ = 1022712426. Its totient is φ = 340904140.

The previous prime is 681808249. The next prime is 681808319. The reversal of 681808282 is 282808186.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 362864401 + 318943881 = 19049^2 + 17859^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 170452069 + ... + 170452072.

Almost surely, 2^681808282 is an apocalyptic number.

681808282 is a deficient number, since it is larger than the sum of its proper divisors (340904144).

681808282 is a wasteful number, since it uses less digits than its factorization.

681808282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340904143.

The product of its (nonzero) digits is 98304, while the sum is 43.

The square root of 681808282 is about 26111.4588255808. The cubic root of 681808282 is about 880.1447256804.

The spelling of 681808282 in words is "six hundred eighty-one million, eight hundred eight thousand, two hundred eighty-two".