685087764 has 48 divisors (see below), whose sum is σ = 1660780800. Its totient is φ = 219538816.

The previous prime is 685087721. The next prime is 685087789. The reversal of 685087764 is 467780586.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79054 + ... + 87290.

It is an arithmetic number, because the mean of its divisors is an integer number (34599600).

Almost surely, 2^685087764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685087764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (830390400).

685087764 is an abundant number, since it is smaller than the sum of its proper divisors (975693036).

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

685087764 is a wasteful number, since it uses less digits than its factorization.

685087764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8512 (or 8510 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 51.

The square root of 685087764 is about 26174.1812479397. The cubic root of 685087764 is about 881.5536277229.

The spelling of 685087764 in words is "six hundred eighty-five million, eighty-seven thousand, seven hundred sixty-four".