685175280 has 80 divisors (see below), whose sum is σ = 2132140320. Its totient is φ = 182017024.

The previous prime is 685175203. The next prime is 685175339. The reversal of 685175280 is 82571586.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59254 + ... + 69866.

It is an arithmetic number, because the mean of its divisors is an integer number (26651754).

Almost surely, 2^685175280 is an apocalyptic number.

685175280 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 685175280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1066070160).

685175280 is an abundant number, since it is smaller than the sum of its proper divisors (1446965040).

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

685175280 is a wasteful number, since it uses less digits than its factorization.

685175280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10898 (or 10892 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 685175280 is about 26175.8529946972. The cubic root of 685175280 is about 881.5911639173.

The spelling of 685175280 in words is "six hundred eighty-five million, one hundred seventy-five thousand, two hundred eighty".