685530125280 has 1440 divisors, whose sum is σ = 3306802514400. Its totient is φ = 131472875520.

The previous prime is 685530125243. The next prime is 685530125281. The reversal of 685530125280 is 82521035586.

685530125280 is a `hidden beast` number, since 6 + 8 + 553 + 0 + 12 + 5 + 2 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (1440).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685530125281) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 90806946 + ... + 90814494.

It is an arithmetic number, because the mean of its divisors is an integer number (2296390635).

Almost surely, 2^685530125280 is an apocalyptic number.

685530125280 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 685530125280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1653401257200).

685530125280 is an abundant number, since it is smaller than the sum of its proper divisors (2621272389120).

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

685530125280 is a wasteful number, since it uses less digits than its factorization.

685530125280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7614 (or 7590 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 685530125280 in words is "six hundred eighty-five billion, five hundred thirty million, one hundred twenty-five thousand, two hundred eighty".