681648441 has 8 divisors (see below), whose sum is σ = 909194784. Its totient is φ = 454267200.

The previous prime is 681648433. The next prime is 681648469. The reversal of 681648441 is 144846186.

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

It is not a de Polignac number, because 681648441 - 2³ = 681648433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681648393 and 681648402.

It is not an unprimeable number, because it can be changed into a prime (681640441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31296 + ... + 48401.

It is an arithmetic number, because the mean of its divisors is an integer number (113649348).

Almost surely, 2^681648441 is an apocalyptic number.

It is an amenable number.

681648441 is a deficient number, since it is larger than the sum of its proper divisors (227546343).

681648441 is a wasteful number, since it uses less digits than its factorization.

681648441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82551.

The product of its digits is 147456, while the sum is 42.

The square root of 681648441 is about 26108.3979018246. The cubic root of 681648441 is about 880.0759408465.

The spelling of 681648441 in words is "six hundred eighty-one million, six hundred forty-eight thousand, four hundred forty-one".