685770639120 has 1280 divisors, whose sum is σ = 2986780262400. Its totient is φ = 141018071040.

The previous prime is 685770639097. The next prime is 685770639133. The reversal of 685770639120 is 21936077586.

685770639120 is a `hidden beast` number, since 6 + 8 + 577 + 0 + 63 + 9 + 1 + 2 + 0 = 666.

685770639120 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 709172877 + ... + 709173843.

It is an arithmetic number, because the mean of its divisors is an integer number (2333422080).

Almost surely, 2^685770639120 is an apocalyptic number.

685770639120 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 685770639120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1493390131200).

685770639120 is an abundant number, since it is smaller than the sum of its proper divisors (2301009623280).

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

685770639120 is a wasteful number, since it uses less digits than its factorization.

685770639120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1121 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 685770639120 in words is "six hundred eighty-five billion, seven hundred seventy million, six hundred thirty-nine thousand, one hundred twenty".