685881764 has 12 divisors (see below), whose sum is σ = 1206578688. Its totient is φ = 341145000.

The previous prime is 685881761. The next prime is 685881773. The reversal of 685881764 is 467188586.

It is not an unprimeable number, because it can be changed into a prime (685881761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448112 + ... + 449639.

It is an arithmetic number, because the mean of its divisors is an integer number (100548224).

Almost surely, 2^685881764 is an apocalyptic number.

It is an amenable number.

685881764 is a deficient number, since it is larger than the sum of its proper divisors (520696924).

685881764 is a wasteful number, since it uses less digits than its factorization.

685881764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897946 (or 897944 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 53.

The square root of 685881764 is about 26189.3444744232. The cubic root of 685881764 is about 881.8940626187.

The spelling of 685881764 in words is "six hundred eighty-five million, eight hundred eighty-one thousand, seven hundred sixty-four".