681446057 has 8 divisors (see below), whose sum is σ = 702776712. Its totient is φ = 660268800.

The previous prime is 681446053. The next prime is 681446081. The reversal of 681446057 is 750644186.

It can be written as a sum of positive squares in 4 ways, for example, as 134073241 + 547372816 = 11579^2 + 23396^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 681446057 - 2² = 681446053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681446053) 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, 29294 + ... + 47127.

It is an arithmetic number, because the mean of its divisors is an integer number (87847089).

Almost surely, 2^681446057 is an apocalyptic number.

It is an amenable number.

681446057 is a deficient number, since it is larger than the sum of its proper divisors (21330655).

681446057 is a wasteful number, since it uses less digits than its factorization.

681446057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76699.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 681446057 is about 26104.5217730569. The cubic root of 681446057 is about 879.9888329334.

The spelling of 681446057 in words is "six hundred eighty-one million, four hundred forty-six thousand, fifty-seven".