685620777120 has 192 divisors, whose sum is σ = 2190306956544. Its totient is φ = 180243947520.

The previous prime is 685620777119. The next prime is 685620777143. The reversal of 685620777120 is 21777026586.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123022654 + ... + 123028226.

It is an arithmetic number, because the mean of its divisors is an integer number (11407848732).

Almost surely, 2^685620777120 is an apocalyptic number.

685620777120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685620777120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1095153478272).

685620777120 is an abundant number, since it is smaller than the sum of its proper divisors (1504686179424).

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

685620777120 is a wasteful number, since it uses less digits than its factorization.

685620777120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9175 (or 9167 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 51.

The spelling of 685620777120 in words is "six hundred eighty-five billion, six hundred twenty million, seven hundred seventy-seven thousand, one hundred twenty".