685111990 has 8 divisors (see below), whose sum is σ = 1233201600. Its totient is φ = 274044792.

The previous prime is 685111961. The next prime is 685112003. The reversal of 685111990 is 99111586.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34255590 + ... + 34255609.

It is an arithmetic number, because the mean of its divisors is an integer number (154150200).

Almost surely, 2^685111990 is an apocalyptic number.

685111990 is a deficient number, since it is larger than the sum of its proper divisors (548089610).

685111990 is a wasteful number, since it uses less digits than its factorization.

685111990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68511206.

The product of its (nonzero) digits is 19440, while the sum is 40.

The square root of 685111990 is about 26174.6440281430. The cubic root of 685111990 is about 881.5640187354.

The spelling of 685111990 in words is "six hundred eighty-five million, one hundred eleven thousand, nine hundred ninety".