685822464 has 200 divisors, whose sum is σ = 2138970240. Its totient is φ = 218363904.

The previous prime is 685822453. The next prime is 685822481. The reversal of 685822464 is 464228586.

685822464 is a `hidden beast` number, since 6 + 8 + 582 + 2 + 4 + 64 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 953497 + ... + 954215.

Almost surely, 2^685822464 is an apocalyptic number.

685822464 is a gapful number since it is divisible by the number (64) 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 685822464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1069485120).

685822464 is an abundant number, since it is smaller than the sum of its proper divisors (1453147776).

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

685822464 is an equidigital number, since it uses as much as digits as its factorization.

685822464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772 (or 747 counting only the distinct ones).

The product of its digits is 737280, while the sum is 45.

The square root of 685822464 is about 26188.2123101215. The cubic root of 685822464 is about 881.8686462725.

The spelling of 685822464 in words is "six hundred eighty-five million, eight hundred twenty-two thousand, four hundred sixty-four".