685779768 has 192 divisors, whose sum is σ = 2050713600. Its totient is φ = 206219520.

The previous prime is 685779767. The next prime is 685779769. The reversal of 685779768 is 867977586.

It is an interprime number because it is at equal distance from previous prime (685779767) and next prime (685779769).

Its product of digits (35562240) is a multiple of the sum of its prime divisors (315).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685779763) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4367946 + ... + 4368102.

It is an arithmetic number, because the mean of its divisors is an integer number (10680800).

Almost surely, 2^685779768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685779768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1025356800).

685779768 is an abundant number, since it is smaller than the sum of its proper divisors (1364933832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685779768 is a wasteful number, since it uses less digits than its factorization.

685779768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 315 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The square root of 685779768 is about 26187.3971215163. The cubic root of 685779768 is about 881.8503455960.

The spelling of 685779768 in words is "six hundred eighty-five million, seven hundred seventy-nine thousand, seven hundred sixty-eight".