681570635 has 8 divisors (see below), whose sum is σ = 820203840. Its totient is φ = 543710464.

The previous prime is 681570583. The next prime is 681570653. The reversal of 681570635 is 536075186.

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 681570635 - 2¹⁰ = 681569611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681570592 and 681570601.

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 7 ways as a sum of consecutive naturals, for example, 191315 + ... + 194844.

It is an arithmetic number, because the mean of its divisors is an integer number (102525480).

Almost surely, 2^681570635 is an apocalyptic number.

681570635 is a deficient number, since it is larger than the sum of its proper divisors (138633205).

681570635 is a wasteful number, since it uses less digits than its factorization.

681570635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386517.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 681570635 is about 26106.9078023423. The cubic root of 681570635 is about 880.0424544773.

The spelling of 681570635 in words is "six hundred eighty-one million, five hundred seventy thousand, six hundred thirty-five".