685790771 has 8 divisors (see below), whose sum is σ = 700752384. Its totient is φ = 670844680.

The previous prime is 685790767. The next prime is 685790801. The reversal of 685790771 is 177097586.

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 685790771 - 2² = 685790767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685790741) 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, 153986 + ... + 158376.

It is an arithmetic number, because the mean of its divisors is an integer number (87594048).

Almost surely, 2^685790771 is an apocalyptic number.

685790771 is a deficient number, since it is larger than the sum of its proper divisors (14961613).

685790771 is a wasteful number, since it uses less digits than its factorization.

685790771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7761.

The product of its (nonzero) digits is 740880, while the sum is 50.

The square root of 685790771 is about 26187.6072026445. The cubic root of 685790771 is about 881.8550618562.

The spelling of 685790771 in words is "six hundred eighty-five million, seven hundred ninety thousand, seven hundred seventy-one".