685372907520 has 896 divisors, whose sum is σ = 2821797434880. Its totient is φ = 156513337344.

The previous prime is 685372907501. The next prime is 685372907537. The reversal of 685372907520 is 25709273586.

685372907520 is a `hidden beast` number, since 6 + 85 + 37 + 2 + 9 + 0 + 7 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (896).

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 63 ways as a sum of consecutive naturals, for example, 627056094 + ... + 627057186.

Almost surely, 2^685372907520 is an apocalyptic number.

685372907520 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 685372907520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1410898717440).

685372907520 is an abundant number, since it is smaller than the sum of its proper divisors (2136424527360).

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

685372907520 is an frugal number, since it uses more digits than its factorization.

685372907520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 685372907520 in words is "six hundred eighty-five billion, three hundred seventy-two million, nine hundred seven thousand, five hundred twenty".