685820938444 has 24 divisors (see below), whose sum is σ = 1219960980000. Its totient is φ = 337261572480.

The previous prime is 685820938367. The next prime is 685820938457. The reversal of 685820938444 is 444839028586.

685820938444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×685820938444² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3076257 + ... + 3291655.

It is an arithmetic number, because the mean of its divisors is an integer number (50831707500).

Almost surely, 2^685820938444 is an apocalyptic number.

It is an amenable number.

685820938444 is a deficient number, since it is larger than the sum of its proper divisors (534140041556).

685820938444 is a wasteful number, since it uses less digits than its factorization.

685820938444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228513 (or 228511 counting only the distinct ones).

The product of its (nonzero) digits is 53084160, while the sum is 61.

The spelling of 685820938444 in words is "six hundred eighty-five billion, eight hundred twenty million, nine hundred thirty-eight thousand, four hundred forty-four".